Cooking errors after migrating to 4.16

[Knox]

Hey guys, I need some advice.

We're developing VR game and really want to migrate our project from 4.13 to 4.16.
It's basically a C++ project, but almost all of it is a bunch of blueprints.
The migration process went pretty well and now game is working fine, but we have trouble packaging it.
It doesn't matter what configuration we build with (development, shipping) we always get those strange cooking errors:

UATHelper: Packaging (Windows (64-bit)): Cook: LogCook:Display: Cooking /Game/Blueprints/System/Players/Implementations/BP_ClassicPlayer -> E:/HighNoon/Saved/Cooked/WindowsNoEditor/HighNoon/Content/Blueprints/System/Players/Implementations/BP_ClassicPlayer.uasset
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: === Handled ensure: ===
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Ensure condition failed: GetSuperClass() [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1236]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Stack: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:233]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:360]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Engine.dll!UBlueprintGeneratedClass::NeedsLoadForClient() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1236]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:833]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:781]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:792]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FArchiveSaveTagExports::operator<<() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:951]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2803]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3512]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:4185]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2999]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2051]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:926]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:589]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2070]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: kernel32.dll!0x0000000076C759CD
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: ntdll.dll!0x0000000076DAA561
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: === Handled ensure: ===
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Ensure condition failed: ClassDefaultObject [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1240]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Stack: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:233]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:360]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Engine.dll!UBlueprintGeneratedClass::NeedsLoadForClient() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1240]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:833]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:781]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:792]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FArchiveSaveTagExports::operator<<() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:951]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2803]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3512]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:4185]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2999]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2051]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:926]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:589]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2070]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: kernel32.dll!0x0000000076C759CD
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: ntdll.dll!0x0000000076DAA561
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: === Handled ensure: ===
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Ensure condition failed: GetSuperClass() [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1220]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Stack: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:233]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:360]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Engine.dll!UBlueprintGeneratedClass::NeedsLoadForServer() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1220]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:838]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:781]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:792]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FArchiveSaveTagExports::operator<<() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:951]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2803]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3512]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:4185]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2999]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2051]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:926]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:589]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2070]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: kernel32.dll!0x0000000076C759CD
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: ntdll.dll!0x0000000076DAA561
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: === Handled ensure: ===
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Ensure condition failed: ClassDefaultObject [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1224]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: Stack: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:233]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:360]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Engine.dll!UBlueprintGeneratedClass::NeedsLoadForServer() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:1224]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:838]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:781]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!ConditionallyExcludeObjectForTarget() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:792]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FArchiveSaveTagExports::operator<<() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:951]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2803]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3512]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:4185]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2999]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2051]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:926]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:589]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2070]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: kernel32.dll!0x0000000076C759CD
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: ntdll.dll!0x0000000076DAA561
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: 
UATHelper: Packaging (Windows (64-bit)): Cook: LogOutputDevice:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogSavePackage:Display: Finished SavePackage E:/HighNoon/Saved/Cooked/WindowsNoEditor/HighNoon/Content/Blueprints/System/Players/Implementations/BP_ClassicPlayer.uasset

...

UATHelper: Packaging (Windows (64-bit)): Cook: LogInit:Display: Failure - 120 error(s), 99 warning(s)

We cooked and built the project many times before using both development and shipping configuration with 4.13 though.

Can somebody help us with this issue?
Thanks!

P.S. I'm attaching cook log to the post, it may help.

[Dr_Jerm]

Any updates on this? In exactly the same situation. The answers posts don't look encouraging:
https://answers.unrealengine.com/que...etsupercl.html
https://answers.unrealengine.com/que...preview-1.html

[sbounds]

Also currently experiencing this exact same issue. Doesn't seem to be any solutions at all in the answers posts or here. I can sometimes fix this error for the asset indicated but on the next cook it errors on a new asset. Currently can't package our project at all.

[Cpt.Trips]

Has anyone found a solution for this by any chance? Or workaround, or indication of what it could relate to?
I'm experiencing a similar problem with 4.25 ("Ensure condition failed: GetSuperClass() [File:[...]BlueprintGeneratedClass.cpp") for a project that is packaging fine with 4.18-4.24.

My issue: https://forums.unrealengine.com/comm...iles-unhelpful

Edit: After some painful hours of searching a needle in a haystack, I think I finally found the issue.
It essentially comes down to 4.25 not coping well with any type of circular reference between two Blueprint assets (in my case an Actor Class and a Function Library) which were perfectly fine before, even with nativization enabled.

It would have been much easier if the cooker at least indicated the object it had problems with...