Unreal Engine Issues

UE-43458

Packaging fails with Event Driven loader enabled and two function libraries reference each other

Packaging fails with Event Driven loader enabled and two function libraries reference each other

Questions & Answers
Description

Packaging fails with Event Driven loader enabled and two function libraries reference each other even though the functions referenced in each library to NOT call each other in such a way as to create a infinite loop. 

UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.06:962][  0]LogCook:Display: Cooking /Engine/EditorResources/LightIcons/S_LightError -> C:/Users/charlie.triplett/Documents/Unreal Projects/DeleteWhenDone/Saved/Cooked/WindowsNoEditor/Engine/Content/EditorResources/LightIcons/S_LightError.uasset
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.06:964][  0]LogSavePackage:Display: Finished SavePackage C:/Users/charlie.triplett/Documents/Unreal Projects/DeleteWhenDone/Saved/Cooked/WindowsNoEditor/Engine/Content/EditorResources/LightIcons/S_LightError.uasset
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:395][  0]LogSavePackage:Error: Cycle Node Create:Libarary1_C /Game/Libarary1.Default__Libarary1_C
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:395][  0]LogSavePackage:Error: Cycle Node Serialize:Function /Game/Library2.Library2_C:lib2fun2
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:396][  0]LogSavePackage:Error: Cycle Node Serialize:BlueprintGeneratedClass /Game/Library2.Library2_C
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:396][  0]LogSavePackage:Error: Cycle Node Create:Library2_C /Game/Library2.Default__Library2_C
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:396][  0]LogSavePackage:Error: Cycle Node Serialize:Function /Game/Libarary1.Libarary1_C:Lib1fun1
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:396][  0]LogSavePackage:Error: Cycle Node Serialize:BlueprintGeneratedClass /Game/Libarary1.Libarary1_C
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:396][  0]LogSavePackage:Error: ----- Create:Libarary1_C /Game/Libarary1.Default__Libarary1_C contained a cycle (listed above).
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:918][  0]LogWindows:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:918][  0]LogWindows:Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:918][  0]LogWindows:Error: 
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:918][  0]LogWindows:Error: Fatal error: [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp] [Line: 3808] 
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: EDL dep graph contained a cycle (see errors, above). This is fatal at runtime so it is fatal at cook time.
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: 
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: 
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: KERNELBASE.dll!0x0000000010F07788
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:120]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:919][  0]LogWindows:Error: UE4Editor-Core.dll!FOutputDevice::Logf__VA() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:920][  0]LogWindows:Error: UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:920][  0]LogWindows:Error: UE4Editor-CoreUObject.dll!FEDLCookChecker::Verify() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3810]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:920][  0]LogWindows:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::NewCook() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:1733]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:921][  0]LogWindows:Error: UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [d:\build\++ue4+release-4.15+compile\sync\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:868]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:921][  0]LogWindows:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2005]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:921][  0]LogWindows:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:921][  0]LogWindows:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:921][  0]LogWindows:Error: UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4+release-4.15+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: KERNEL32.DLL!0x0000000012138364
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: ntdll.dll!0x00000000146370D1
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: ntdll.dll!0x00000000146370D1
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: 
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.03.29-17.48.08:922][  0]LogWindows:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Cook failed. ---> AutomationTool.AutomationException: BUILD FAILED: Failed while running Cook for C:\Users\charlie.triplett\Documents\Unreal Projects\DeleteWhenDone\DeleteWhenDone.uproject; see log C:\Users\charlie.tripl
UATHelper: Packaging (Windows (64-bit)): Program.Main: AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
PackagingResults:Error: Error Unknown Cook Failure
Steps to Reproduce
  1. Open the editor
  2. Create a new function library
  3. Name it Library 1
  4. Create a new function library
  5. Name it Library 2
  6. In Library 1 Create 2 functions
  7. Name them "Function 1" and "Function 2"
  8. In Library 2 Create 2 functions
  9. Name them "Function 3" and "Function 4"
  10. In Library 1 set "Function 1" to call "Function 3" (Function 3 is inside of library 2)
  11. In Library 2 set "Function 4" to call "Function 2" (Function 2 is inside of library 1)
  12. Compile and save
  13. Open the level blueprint
  14. Call function 1 on begin play
  15. Save and compile
  16. Package for windows 64 bit
  17. Notice that the project fails to package (errors provided in description)

Expected: The project would package out with a warning of possible infinite loops (non exist in this example)
Result: The project fails to package even though calling the function in a packaged game does not result in a crash or infinite loop

Community References

Crash with nativized BPs, Error: Cycle Node

What is Error in "Cycle Node"?

Should I Use multiply Blueprint Function Libraries?

4.15 Build fails "EDL dep graph contained a cycle"

Have Comments or More Details?

Head over to the existing Questions & Answers thread and let us know what's up.

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Fixed
ComponentUE - Foundation - Core
Affects Versions4.15.1
Target Fix4.25.2
Fix Commit13633566
Main Commit3582334
Release Commit13633566
CreatedMar 29, 2017
ResolvedJun 5, 2020
UpdatedJan 12, 2021