Crash when migrating to 4.8.2 from 4.7.6

Community Community & Industry Discussion
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1

As the title says, i am currently trying to migrate but run into a crash at 93% on editior loadup. The project runs perfectly fine in 4.7.6. Not exactly sure what it could be. The crash report is as follows:

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 11]
Cast of Class /Script/Engine.BlueprintGeneratedClass to BlueprintGeneratedClass failed

KERNELBASE.dll {0x000007fefbcfb3dd} + 0 bytes
UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() {0x000007fee3207c0f} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FOutputDevice::Logf__VA() {0x000007fee30c10b8} + 159 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FDebug::AssertFailed() {0x000007fee3091e72} + 65 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!CastLogError() {0x000007fee583ccdf} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!CastChecked() {0x000007fee029d271} + 89 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!UActorComponent::PostLoad() {0x000007fee0d62a49} + 23 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!UPrimitiveComponent::PostLoad() {0x000007fee0dd3b92} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UMG.dll!UWidgetComponent::PostLoad() {0x000007fedb84e5ef} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() {0x000007fee58e9a3f} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() {0x000007fee58e9a2c} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() {0x000007fee58e9a2c} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!EndLoad() {0x000007fee59e4f97} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!LoadPackageInternal() {0x000007fee59f4a67} + 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!UEditorEngine::Map_Load() {0x000007fedde89e25} + 29 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!UEditorEngine::HandleMapCommand() {0x000007fedde766f5} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!UEditorEngine::Exec() {0x000007fedde5ffd0} + 21 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Exec() {0x000007fede275aa1} + 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadMap() {0x000007feddf06bb0} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!FEditorFileUtils::LoadDefaultMapAtStartup() {0x000007feddf0681e} + 56 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!FUnrealEdMisc::OnInit() {0x000007fede2b6056} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!EditorInit() {0x000007fede273a8e} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor.exe!GuardedMain() {0x000000013fdd472e} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor.exe!GuardedMainWrapper() {0x000000013fdd4a4a} + 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor.exe!WinMain() {0x000000013fde65c9} + 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor.exe!__tmainCRTStartup() {0x000000013fde75d9} + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
kernel32.dll {0x0000000076ea59cd} + 0 bytes
ntdll.dll {0x00000000770db981} + 0 bytes
ntdll.dll {0x00000000770db981} + 0 bytes

2

Hi ,

Does this produce any crash logs? You can check this in the filepath \Unreal Projects\PROJECTNAME\saved\logs. Additionally, Does this occur with a blank project created and migrated to 4.8 from 4.7? Can you create a new project in 4.8?

3

I can create projects in 4.8.2 and migrate other projects across aswell. It seems it is just this project. Attached is the logs from the crash

link text

4

What steps are you taking to migrate your content over? For instance, are you attempting to update from the project browser in the editor or did you right click the uproject and press “Switch engine versions”? Try pulling out your blueprints folder and then updating. If that works try re-adding the blueprints folder and see if it allows you to add it back in. It looks like the errors you are getting are referencing a blueprint cast, so we can start there and work our way to the root error.

5

Hi ,

We have not heard from you in several days. I am marking this thread as answered for tracking purposes. If you are still experiencing this error, please comment back with the requested information.

6

Sorry had a very busy weekend. Thats a good idea cant believe i didn’t think of that lol.

I have narrowed it down to 1 blueprint at Content/ThirdPerson/Maps/MainMenu.umap. I’ll see if i can figure out what is causing it and get back to you.