Error Unknown Cook Failure!(FIXED)

Development Platform & Builds
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This is the error I found in your logs. Is the Editor crashing when you’re packaging? I looked in our logs for this error and I see a few people ran into this error in 4.12. Could you please try 4.13 and see if the issue has been fixed?

[2016.09.07-12.20.39:171][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.09.07-12.20.39:157][  0]LogOutputDevice:Warning: === Handled error: ===

[2016.09.07-12.20.39:171][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:171][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:171][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:171][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: Ensure condition failed: !bUseRawDataOnly [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\Animation\AnimSequence.cpp] [Line: 325]

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: Stack: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:183]

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Core.dll!FDebug::EnsureFailed() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:327]

[2016.09.07-12.20.39:172][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Core.dll!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:451]

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Engine.dll!UAnimSequence::PreSave() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\animation\animsequence.cpp:325]

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:2784]

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:173][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3340]

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UEditorEngine::Save() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:3891]

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2551]

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\cookontheflyserver.cpp:1937]

[2016.09.07-12.20.39:174][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UCookCommandlet::NewCook() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:1375]

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:679]

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:1780]

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launch.cpp:114]

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:175][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:176][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: KERNEL32.DLL

[2016.09.07-12.20.39:177][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:177][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: ntdll.dll

[2016.09.07-12.20.39:177][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 

[2016.09.07-12.20.39:177][ 22]MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: ntdll.dll