Unreal Engine Issues and Bug Tracker (UE-52528)

Description

Overriding a BlueprintNativeEvent function with a const reference parameter in blueprints causes the project to fail to package if the blueprint is nativized.

Note:
This only occurs if the function has a return value. If the function returns void the project will still compile successfully.

Regression:
No - behavior also occurs in 4.17.2 (CL 2658906)

Steps to Reproduce

Open UE4 Editor (any project)
Add code to project based on actor (MyActor)

Add the following to MyActor.h:

UFUNCTION(BlueprintNativeEvent, Category = test)
		bool TestFunc(const float& Rando);
	virtual bool TestFunc_Implementation(const float& Rando);

Add the following to MyActor.cpp:

bool AMyActor::TestFunc_Implementation(const float& Rando)
{
	return true;
}

Compile
Create a blueprint based on MyActor (MyActorBP)
In the MyBlueprint tab, hover over the dark gray Functions bar and open Override dropdown
Select TestFunc to create override for it
Open Class Settings and check the box for Nativize
In Project Settings, Set Nativization Method to Exclusive and add MyActorBP to the list of blueprints to nativize
File->Package Project->Windows->Windows(64-bit)

Result:
Package process fails with provided output

Expected:
Project is packaged for

Callstack

UATHelper: Packaging (Windows (64-bit)): Running AutomationTool...
UATHelper: Packaging (Windows (64-bit)): Parsing command line: -ScriptsForProject="D:/Projects/UnrealProjects/CharacterNameArray 4.18/CharacterNameArray.uproject" BuildCookRun -nocompile -nocompileeditor -installed -nop4 -project="D:/Projects/UnrealProjects/CharacterNameArray 4.18/CharacterNameArray.uproject" -cook -stage -archive -archivedirectory="D:/Proje
cts/UnrealProjects/CharacterNameArray 4.18" -package -clientconfig=Development -ue4exe=UE4Editor-Cmd.exe -pak -prereqs -nodebuginfo -targetplatform=Win64 -build -utf8output
UATHelper: Packaging (Windows (64-bit)): Setting up ProjectParams for D:\Projects\UnrealProjects\CharacterNameArray 4.18\CharacterNameArray.uproject
UATHelper: Packaging (Windows (64-bit)): ********** BUILD COMMAND STARTED **********
UATHelper: Packaging (Windows (64-bit)): No build products were made
UATHelper: Packaging (Windows (64-bit)): ********** BUILD COMMAND COMPLETED **********
UATHelper: Packaging (Windows (64-bit)): ********** COOK COMMAND STARTED **********
UATHelper: Packaging (Windows (64-bit)): Running UE4Editor Cook for project D:\Projects\UnrealProjects\CharacterNameArray 4.18\CharacterNameArray.uproject
UATHelper: Packaging (Windows (64-bit)): Commandlet log file is D:\Epic Games\UE_4.18\Engine\Programs\AutomationTool\Saved\Cook-2017.11.17-14.59.17.txt
UATHelper: Packaging (Windows (64-bit)): Running: D:\Epic Games\UE_4.18\Engine\Binaries\Win64\UE4Editor-Cmd.exe "D:\Projects\UnrealProjects\CharacterNameArray 4.18\CharacterNameArray.uproject" -run=Cook  -NoLogTimes -TargetPlatform=WindowsNoEditor -fileopenlog -unversioned -abslog="D:\Epic Games\UE_4.18\Engine\Programs\AutomationTool\Saved\Cook-2017.11.17-14
.59.17.txt" -stdout -CrashForUAT -unattended  -UTF8Output
UATHelper: Packaging (Windows (64-bit)):   LogInit: Display: Running engine for game: CharacterNameArray
UATHelper: Packaging (Windows (64-bit)):   LogInit: Display: RandInit(-1914398660) SRandInit(-1914398660).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Warning: Module file ../../../../../Projects/UnrealProjects/CharacterNameArray 4.18/Binaries/Win64/UE4Editor-CharacterNameArray-3230.dll is missing. This is likely a stale module that must be recompiled.
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/2D/Paper2D/Binaries/Win64/UE4Editor-Paper2D.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/2D/Paper2D/Binaries/Win64/UE4Editor-Paper2DEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/2D/Paper2D/Binaries/Win64/UE4Editor-PaperSpriteSheetImporter.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/2D/Paper2D/Binaries/Win64/UE4Editor-PaperTiledImporter.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/2D/Paper2D/Binaries/Win64/UE4Editor-SmartSnapping.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Blendables/LightPropagationVolume/Binaries/Win64/UE4Editor-LightPropagationVolumeRuntime.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Blendables/LightPropagationVolume/Binaries/Win64/UE4Editor-LightPropagationVolumeEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/GitSourceControl/Binaries/Win64/UE4Editor-GitSourceControl.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/PerforceSourceControl/Binaries/Win64/UE4Editor-PerforceSourceControl.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/SubversionSourceControl/Binaries/Win64/UE4Editor-SubversionSourceControl.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/UObjectPlugin/Binaries/Win64/UE4Editor-UObjectPlugin.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/VisualStudioCodeSourceCodeAccess/Binaries/Win64/UE4Editor-VisualStudioCodeSourceCodeAccess.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Developer/VisualStudioSourceCodeAccess/Binaries/Win64/UE4Editor-VisualStudioSourceCodeAccess.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/AssetManagerEditor/Binaries/Win64/UE4Editor-AssetManagerEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/AudioCapture/Binaries/Win64/UE4Editor-AudioCapture.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/FacialAnimation/Binaries/Win64/UE4Editor-FacialAnimation.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/FacialAnimation/Binaries/Win64/UE4Editor-FacialAnimationEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/GameplayTagsEditor/Binaries/Win64/UE4Editor-GameplayTagsEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/MobileLauncherProfileWizard/Binaries/Win64/UE4Editor-MobileLauncherProfileWizard.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/PluginBrowser/Binaries/Win64/UE4Editor-PluginBrowser.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Editor/SpeedTreeImporter/Binaries/Win64/UE4Editor-SpeedTreeImporter.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Experimental/AlembicImporter/Binaries/Win64/UE4Editor-AlembicImporter.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Experimental/AlembicImporter/Binaries/Win64/UE4Editor-AlembicLibrary.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Experimental/CharacterAI/Binaries/Win64/UE4Editor-CharacterAI.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Experimental/HTML5Networking/Binaries/Win64/UE4Editor-HTML5Networking.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/AndroidMedia/Binaries/Win64/UE4Editor-AndroidMediaEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/AndroidMedia/Binaries/Win64/UE4Editor-AndroidMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/AvfMedia/Binaries/Win64/UE4Editor-AvfMediaEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/AvfMedia/Binaries/Win64/UE4Editor-AvfMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/AvfMedia/Binaries/Win64/UE4Editor-AvfMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/ImgMedia/Binaries/Win64/UE4Editor-ImgMedia.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/ImgMedia/Binaries/Win64/UE4Editor-ImgMediaEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/ImgMedia/Binaries/Win64/UE4Editor-ImgMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/ImgMedia/Binaries/Win64/UE4Editor-ImgMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/ImgMedia/Binaries/Win64/UE4Editor-OpenExrWrapper.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/MediaCompositing/Binaries/Win64/UE4Editor-MediaCompositing.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/MediaCompositing/Binaries/Win64/UE4Editor-MediaCompositingEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/MediaPlayerEditor/Binaries/Win64/UE4Editor-MediaPlayerEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/WmfMedia/Binaries/Win64/UE4Editor-WmfMedia.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/WmfMedia/Binaries/Win64/UE4Editor-WmfMediaEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/WmfMedia/Binaries/Win64/UE4Editor-WmfMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Media/WmfMedia/Binaries/Win64/UE4Editor-WmfMediaFactory.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Messaging/TcpMessaging/Binaries/Win64/UE4Editor-TcpMessaging.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Messaging/UdpMessaging/Binaries/Win64/UE4Editor-UdpMessaging.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/MovieScene/ActorSequence/Binaries/Win64/UE4Editor-ActorSequence.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/MovieScene/LevelSequenceEditor/Binaries/Win64/UE4Editor-LevelSequenceEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/MovieScene/MatineeToLevelSequence/Binaries/Win64/UE4Editor-MatineeToLevelSequence.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Online/OnlineSubsystem/Binaries/Win64/UE4Editor-OnlineSubsystem.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Online/OnlineSubsystemNull/Binaries/Win64/UE4Editor-OnlineSubsystemNull.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Online/OnlineSubsystemUtils/Binaries/Win64/UE4Editor-OnlineSubsystemUtils.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Online/OnlineSubsystemUtils/Binaries/Win64/UE4Editor-OnlineBlueprintSupport.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/AndroidDeviceProfileSelector/Binaries/Win64/UE4Editor-AndroidDeviceProfileSelector.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/AndroidPermission/Binaries/Win64/UE4Editor-AndroidPermission.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/AppleARKit/Binaries/Win64/UE4Editor-AppleARKit.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ArchVisCharacter/Binaries/Win64/UE4Editor-ArchVisCharacter.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/CableComponent/Binaries/Win64/UE4Editor-CableComponent.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/CustomMeshComponent/Binaries/Win64/UE4Editor-CustomMeshComponent.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ExampleDeviceProfileSelector/Binaries/Win64/UE4Editor-ExampleDeviceProfileSelector.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ImmediatePhysics/Binaries/Win64/UE4Editor-ImmediatePhysics.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ImmediatePhysics/Binaries/Win64/UE4Editor-ImmediatePhysicsEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/LocationServicesBPLibrary/Binaries/Win64/UE4Editor-LocationServicesBPLibrary.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/MobilePatchingUtils/Binaries/Win64/UE4Editor-MobilePatchingUtils.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/Oculus/OculusVR/Binaries/Win64/UE4Editor-OculusHMD.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/Oculus/OculusVR/Binaries/Win64/UE4Editor-OculusInput.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/Oculus/OculusVR/Binaries/Win64/UE4Editor-OculusEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/PhysXVehicles/Binaries/Win64/UE4Editor-PhysXVehicles.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/PhysXVehicles/Binaries/Win64/UE4Editor-PhysXVehiclesEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ProceduralMeshComponent/Binaries/Win64/UE4Editor-ProceduralMeshComponent.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/ProceduralMeshComponent/Binaries/Win64/UE4Editor-ProceduralMeshComponentEditor.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/RuntimePhysXCooking/Binaries/Win64/UE4Editor-RuntimePhysXCooking.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/Steam/SteamVR/Binaries/Win64/UE4Editor-SteamVR.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/Steam/SteamVR/Binaries/Win64/UE4Editor-SteamVRController.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogModuleManager: Display: Found up-to-date module file ../../../Engine/Plugins/Runtime/WindowsMoviePlayer/Binaries/Win64/UE4Editor-WindowsMoviePlayer.dll (API version 3709383).
UATHelper: Packaging (Windows (64-bit)):   LogInit: Warning: Incompatible or missing module: UE4Editor-CharacterNameArray.dll
UATHelper: Packaging (Windows (64-bit)): Took 2.378s to run UE4Editor-Cmd.exe, ExitCode=1
UATHelper: Packaging (Windows (64-bit)): Cook failed. Deleting cooked data.
UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed.
UATHelper: Packaging (Windows (64-bit)):        (see C:\Users\doug.wilson\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.18\UAT_Log.txt for full exception trace)
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure

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Fixed

Component	UE - Gameplay
Affects Versions	4.17.2, 4.18.1
Target Fix	4.19

Fix Commit	3783678
Main Commit	3804136
Release Commit	3813083

Created	Nov 17, 2017
Resolved	Dec 1, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-52528

Project fails to package nativized const reference parameter

Project fails to package nativized const reference parameter

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