Same here as of Nov 7. Can’t package any builds while Fab plugin is active. Disabling plugin resolves issue.
UE 5.4.4 source build
Modded Lyra game
Seems like this should be higher priority.
[2024.11.07-09.12.49:384][263]UATHelper: Packaging (Windows): LogOutputDevice: Warning:
[2024.11.07-09.12.49:384][263]UATHelper: Packaging (Windows): Script Stack (0 frames) :
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: appError called: Assertion failed: CurrentApplication.IsValid() [File:F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: begin: stack for UAT
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: === Critical error: ===
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error:
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: Assertion failed: CurrentApplication.IsValid() [File:F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error:
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error:
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error:
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x000002cde4e94504 UnrealEditor-Fab.dll!FSlateApplication::Get() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h:256]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x000002cde4eacb2d UnrealEditor-Fab.dll!FFabBrowser::RegisterSlateStyle() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabBrowser.cpp:98]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x000002cde4ea1ffd UnrealEditor-Fab.dll!FFabBrowser::Init() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabBrowser.cpp:68]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x000002cde4eb7610 UnrealEditor-Fab.dll!FFabModule::StartupModule() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabModule.cpp:36]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffef878a4da UnrealEditor-Core.dll!FModuleManager::LoadModuleWithFailureReason() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:674]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007fff83d9a854 UnrealEditor-Projects.dll!FModuleDescriptor::LoadModulesForPhase() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\ModuleDescriptor.cpp:696]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007fff83db6e61 UnrealEditor-Projects.dll!FPluginManager::TryLoadModulesForPlugin() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2766]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007fff83d9a10e UnrealEditor-Projects.dll!FPluginManager::LoadModulesForEnabledPlugins() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2903]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504e34e2 UnrealEditor-Cmd.exe!FEngineLoop::LoadStartupModules() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4745]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504e7079 UnrealEditor-Cmd.exe!FEngineLoop::PreInitPostStartupScreen() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4000]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504de146 UnrealEditor-Cmd.exe!GuardedMain() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Launch.cpp:136]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504de42a UnrealEditor-Cmd.exe!GuardedMainWrapper() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504e18a4 UnrealEditor-Cmd.exe!LaunchWindowsStartup() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504f70c4 UnrealEditor-Cmd.exe!WinMain() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff7504f96e6 UnrealEditor-Cmd.exe!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff834797374 KERNEL32.DLL!UnknownFunction []
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error:
[2024.11.07-09.12.49:878][307]UATHelper: Packaging (Windows): LogWindows: Error: end: stack for UAT
[2024.11.07-09.12.49:880][307]PackagingResults: Error: appError called: Assertion failed: CurrentApplication.IsValid() [File:F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: begin: stack for UAT
[2024.11.07-09.12.49:880][307]PackagingResults: Error: === Critical error: ===
[2024.11.07-09.12.49:880][307]PackagingResults: Error: Assertion failed: CurrentApplication.IsValid() [File:F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x000002cde4e94504 UnrealEditor-Fab.dll!FSlateApplication::Get() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h:256]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x000002cde4eacb2d UnrealEditor-Fab.dll!FFabBrowser::RegisterSlateStyle() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabBrowser.cpp:98]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x000002cde4ea1ffd UnrealEditor-Fab.dll!FFabBrowser::Init() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabBrowser.cpp:68]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x000002cde4eb7610 UnrealEditor-Fab.dll!FFabModule::StartupModule() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Plugins\Fab\Source\Fab\Private\FabModule.cpp:36]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007ffef878a4da UnrealEditor-Core.dll!FModuleManager::LoadModuleWithFailureReason() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:674]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007fff83d9a854 UnrealEditor-Projects.dll!FModuleDescriptor::LoadModulesForPhase() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\ModuleDescriptor.cpp:696]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007fff83db6e61 UnrealEditor-Projects.dll!FPluginManager::TryLoadModulesForPlugin() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2766]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007fff83d9a10e UnrealEditor-Projects.dll!FPluginManager::LoadModulesForEnabledPlugins() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2903]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007ff7504e34e2 UnrealEditor-Cmd.exe!FEngineLoop::LoadStartupModules() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4745]
[2024.11.07-09.12.49:880][307]PackagingResults: Error: [Callstack] 0x00007ff7504e7079 UnrealEditor-Cmd.exe!FEngineLoop::PreInitPostStartupScreen() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4000]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff7504de146 UnrealEditor-Cmd.exe!GuardedMain() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Launch.cpp:136]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff7504de42a UnrealEditor-Cmd.exe!GuardedMainWrapper() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff7504e18a4 UnrealEditor-Cmd.exe!LaunchWindowsStartup() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff7504f70c4 UnrealEditor-Cmd.exe!WinMain() [F:\Unreal Engine\UE_5.4.4_Build\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff7504f96e6 UnrealEditor-Cmd.exe!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2024.11.07-09.12.49:881][307]PackagingResults: Error: [Callstack] 0x00007ff834797374 KERNEL32.DLL!UnknownFunction []
[2024.11.07-09.12.49:881][307]PackagingResults: Error: end: stack for UAT
[2024.11.07-09.12.49:930][311]UATHelper: Packaging (Windows): Took 6.84s to run UnrealEditor-Cmd.exe, ExitCode=3
[2024.11.07-09.12.49:962][314]UATHelper: Packaging (Windows): Cook failed.
[2024.11.07-09.12.49:962][314]UATHelper: Packaging (Windows): (see F:\Unreal Engine\UE_5.4.4_Build\Engine\Programs\AutomationTool\Saved\Logs\Log.txt for full exception trace)
[2024.11.07-09.12.49:972][314]UATHelper: Packaging (Windows): AutomationTool executed for 0h 0m 19s
[2024.11.07-09.12.49:972][314]UATHelper: Packaging (Windows): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
[2024.11.07-09.12.50:004][316]UATHelper: Packaging (Windows): BUILD FAILED
[2024.11.07-09.12.50:005][317]LogStreaming: Display: FlushAsyncLoading(440): 1 QueuedPackages, 0 AsyncPackages
[2024.11.07-09.12.50:016][317]PackagingResults: Error: Unknown Cook Failure