Assertion failed:Default__REINST is class of ...

DA-DA · May 21, 2025, 2:04am

When I try to modify a Blueprint structure, the Editor crashed and show the following report:
Assertion failed: ((UObject*)ContainerPtr)->IsA(GetOwner()) [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 714]
‘Default__REINST_SKEL_BP_A_C_1377’ is of class ‘REINST_SKEL_BP_A_C_1377’ however property ‘COP_XXX’ belongs to class ‘SKEL_B_C’
The problem paused my work.
How can I fix this problem?
Tnks!

nande · May 21, 2025, 5:03am

can you share more of the log or stack?
what’s the context of that issue?

DA-DA · May 22, 2025, 12:16am

Thank you for your answer!

The context:

<?xml version="1.0" encoding="UTF-8"?>
<FGenericCrashContext>
	<RuntimeProperties>
		<CrashVersion>3</CrashVersion>
		<ExecutionGuid></ExecutionGuid>
		<CrashGUID>UECC-Windows</CrashGUID>
		<IsEnsure>false</IsEnsure>
		<IsStall>false</IsStall>
		<IsAssert>true</IsAssert>
		<CrashType>Assert</CrashType>
		<ErrorMessage>Assertion failed: ((UObject*)ContainerPtr)-&gt;IsA(GetOwner&lt;UClass&gt;()) [File:F:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 714] 
&apos;Default__REINST_SKEL_BP_Grandchild_C_5835&apos; is of class &apos;REINST_SKEL_BP_Grandchild_C_5835&apos; however property &apos;Sphere&apos; belongs to class &apos;SKEL_BP_Parent_C&apos;
</ErrorMessage>
		<CrashReporterMessage />
		<CrashReporterMessage>Attended</CrashReporterMessage>
		<ProcessId></ProcessId>
		<SecondsSinceStart>13072</SecondsSinceStart>
		<IsInternalBuild>false</IsInternalBuild>
		<IsPerforceBuild>false</IsPerforceBuild>
		<IsWithDebugInfo>true</IsWithDebugInfo>
		<IsSourceDistribution>false</IsSourceDistribution>
		<GameName>UE-Test</GameName>
		<ExecutableName>UnrealEditor</ExecutableName>
		<BuildConfiguration>Development</BuildConfiguration>
		<GameSessionID />
		<PlatformName>WindowsEditor</PlatformName>
		<PlatformFullName>Win64 [Windows 10]  64b]</PlatformFullName>
		<PlatformNameIni>Windows</PlatformNameIni>
		<EngineMode>Editor</EngineMode>
		<EngineModeEx>Dirty</EngineModeEx>
		<DeploymentName />
		<EngineVersion>5.5.4-40574608+++UE5+Release-5.5</EngineVersion>
		<EngineCompatibleVersion>5.5.4-40574608+++UE5+Release-5.5</EngineCompatibleVersion>
		<CommandLine>F:\Workspace\Test\Test.uproject</CommandLine>
		<LanguageLCID>9</LanguageLCID>
		<AppDefaultLocale>zh-CN</AppDefaultLocale>
		<BuildVersion>++UE5+Release-5.5-CL-40574608</BuildVersion>
		<Symbols>**UE5*Release-5.5-CL-40574608-Win64-Development</Symbols>
		<IsUERelease>true</IsUERelease>
		<IsRequestingExit>false</IsRequestingExit>
		<UserName />
		<BaseDir>F:/Program/Epic Games/UE_5.5/Engine/Binaries/Win64/</BaseDir>
		<RootDir>F:/Program/Epic Games/UE_5.5/</RootDir>
		<MachineId></MachineId>
		<LoginId></LoginId>
		<EpicAccountId />
		<SourceContext />
		<UserDescription />
		<UserActivityHint>Layout=&quot;UserDefinedStruct_MemberVariablesEditor&quot; Label=&quot;Structu</UserActivityHint>
		<CrashDumpMode>0</CrashDumpMode>
		<GameStateName />
		<Misc.NumberOfCores>6</Misc.NumberOfCores>
		<Misc.NumberOfCoresIncludingHyperthreads>12</Misc.NumberOfCoresIncludingHyperthreads>
		<Misc.Is64bitOperatingSystem>1</Misc.Is64bitOperatingSystem>
		<Misc.CPUVendor>GenuineIntel</Misc.CPUVendor>
		<CallStack>UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_StructUtilsEditor
UnrealEditor_StructUtilsEditor
UnrealEditor_UnrealEd
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UnrealEditor_KismetCompiler
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_Kismet
UnrealEditor_Kismet
UnrealEditor_Slate
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UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll</CallStack>
		<PCallStack>

UnrealEditor-CoreUObject 0x00007fff62df0000 + 444af0 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 479b55 
UnrealEditor-Engine 0x00007fff52f40000 + 5d4cff 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 65674c 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 61cbd8 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 243709 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 260273 
UnrealEditor-StructUtilsEditor 0x000001c9b3a10000 + 37c85 
UnrealEditor-StructUtilsEditor 0x000001c9b3a10000 + 32d36 
UnrealEditor-UnrealEd 0x00007fff50580000 + e5c5bd 
UnrealEditor-KismetCompiler 0x00007fff43170000 + 82837 
UnrealEditor-KismetCompiler 0x00007fff43170000 + 291d 
UnrealEditor-UnrealEd 0x00007fff50580000 + e610a9 
UnrealEditor-UnrealEd 0x00007fff50580000 + e561a7 
UnrealEditor-Kismet 0x00007fff4e670000 + 889c58 
UnrealEditor-Kismet 0x00007fff4e670000 + 8583da 
UnrealEditor-Slate 0x00007fff62780000 + 28145c 
UnrealEditor-Slate 0x00007fff62780000 + 29f332 
UnrealEditor-Slate 0x00007fff62780000 + 2a7eb 
UnrealEditor-Slate 0x00007fff62780000 + 154a4 
UnrealEditor-Slate 0x00007fff62780000 + 6f23f 
UnrealEditor-Slate 0x00007fff62780000 + 5d5c6 
UnrealEditor-Slate 0x00007fff62780000 + 51f9c 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 3aaf0 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 25786 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 3d85e 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 205b7 
USER32 0x00007fffd7750000 + ef5c 
USER32 0x00007fffd7750000 + e684 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 5bb26 
UnrealEditor 0x00007ff7e8310000 + 632d 
UnrealEditor 0x00007ff7e8310000 + 257ac 
UnrealEditor 0x00007ff7e8310000 + 2589a 
UnrealEditor 0x00007ff7e8310000 + 29114 
UnrealEditor 0x00007ff7e8310000 + 3bd04 
UnrealEditor 0x00007ff7e8310000 + 3f0ba 
KERNEL32 0x00007fffd7680000 + 17374 
ntdll 0x00007fffd84d0000 + 4cc91 
</PCallStack>
		<PCallStackHash></PCallStackHash>
		<Threads>
			<Thread>
				<CallStack>KERNELBASE 0x00007fffd60c0000 + 3b699 
UnrealEditor-Core 0x00007fff638f0000 + 6b1592 
UnrealEditor-Core 0x00007fff638f0000 + 6b4cc0 
UnrealEditor-Core 0x00007fff638f0000 + 4fa99f 
UnrealEditor-Core 0x00007fff638f0000 + 418f37 
UnrealEditor-Core 0x00007fff638f0000 + 41c7ac 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 444af0 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 479b55 
UnrealEditor-Engine 0x00007fff52f40000 + 5d4cff 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 65674c 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 61cbd8 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 243709 
UnrealEditor-CoreUObject 0x00007fff62df0000 + 260273 
UnrealEditor-StructUtilsEditor 0x000001c9b3a10000 + 37c85 
UnrealEditor-StructUtilsEditor 0x000001c9b3a10000 + 32d36 
UnrealEditor-UnrealEd 0x00007fff50580000 + e5c5bd 
UnrealEditor-KismetCompiler 0x00007fff43170000 + 82837 
UnrealEditor-KismetCompiler 0x00007fff43170000 + 291d 
UnrealEditor-UnrealEd 0x00007fff50580000 + e610a9 
UnrealEditor-UnrealEd 0x00007fff50580000 + e561a7 
UnrealEditor-Kismet 0x00007fff4e670000 + 889c58 
UnrealEditor-Kismet 0x00007fff4e670000 + 8583da 
UnrealEditor-Slate 0x00007fff62780000 + 28145c 
UnrealEditor-Slate 0x00007fff62780000 + 29f332 
UnrealEditor-Slate 0x00007fff62780000 + 2a7eb 
UnrealEditor-Slate 0x00007fff62780000 + 154a4 
UnrealEditor-Slate 0x00007fff62780000 + 6f23f 
UnrealEditor-Slate 0x00007fff62780000 + 5d5c6 
UnrealEditor-Slate 0x00007fff62780000 + 51f9c 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 3aaf0 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 25786 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 3d85e 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 205b7 
USER32 0x00007fffd7750000 + ef5c 
USER32 0x00007fffd7750000 + e684 
UnrealEditor-ApplicationCore 0x00007fffa6e80000 + 5bb26 
UnrealEditor 0x00007ff7e8310000 + 632d 
UnrealEditor 0x00007ff7e8310000 + 257ac 
UnrealEditor 0x00007ff7e8310000 + 2589a 
UnrealEditor 0x00007ff7e8310000 + 29114 
UnrealEditor 0x00007ff7e8310000 + 3bd04 
UnrealEditor 0x00007ff7e8310000 + 3f0ba 
KERNEL32 0x00007fffd7680000 + 17374 
ntdll 0x00007fffd84d0000 + 4cc91 
</CallStack>
				<IsCrashed>true</IsCrashed>
				<Registers />
				<ThreadID></ThreadID>
				<ThreadName>GameThread</ThreadName>
			</Thread>
			<Thread>
				<CallStack>ntdll 0x00007fffd84d0000 + 9d814 
KERNELBASE 0x00007fffd60c0000 + 76eb3 
KERNEL32 0x00007fffd7680000 + 1d3bc 
UnrealEditor-Core 0x00007fff638f0000 + 6b1e83 
UnrealEditor-Core 0x00007fff638f0000 + 6a42a4 
UnrealEditor-Core 0x00007fff638f0000 + 6b3fd9 
KERNEL32 0x00007fffd7680000 + 17374 
ntdll 0x00007fffd84d0000 + 4cc91 
</CallStack>

I upgrade my project from UE5.4 to UE5.5 then it crashed. It’s fine in UE5.4.
The Grandchild_C can be anyone which has a reference of the structure. It changes sometimes.

nande · May 22, 2025, 12:21am

ahh that might be an issue.
i think that when you did the upgrade you might have messed up with the namespace of the project, breaking the class information.
so now your bp can’t find the parent, or it gets confused.

i assume you stil have a copy of the 5.4 version (and you always should if you want to avoid problems).
try making the port again.
but start by copying the whole project to a new folder manually, then open with the new engine, and when asked click “more options” then “convert in place”.

or you can try by
close everything
then delete intermediate, binaries and saved.
opening the .uproject and change the version to 5.5.
then right click the uproject and choose “regenerate project files” or smth.

DA-DA · May 22, 2025, 2:54am

Thank you very much!
My project is BP project.I’m trying to download VS2022 and Regenerate it!
By the way, Is there a way to convert C++ Back to BP?

DA-DA · May 22, 2025, 4:42am

I regenerate the project files,but the bug still occurred.

There’re many works in UE5.5 version of my project, is there a good way to keep them?

nande · May 22, 2025, 6:17am

i’m not sure. you could remove the source folder, but you need to make sure everything is in bp before that.

make a backup.
always use some sort of repo or backup. otherwise you’ll lose data constantly. regardless of the engine.

DA-DA · May 24, 2025, 1:06am

Thank you !
sorry can’t load forum yesterday

I try to convert UE54 to UE55 again in place, the bug still occured. Seems it’s a bug of UE55.
I find a dirty way to change the structure :
create a new project and copy the content folder then edit the structure before linkers generated. then paste back the new structure to original project.
I don’t know is it safe.

Is the LINKER in an uasset?

nande · May 24, 2025, 6:21am

i have no idea what you mean by linker.

there’s something odd with your project.
maybe the base class is not being compiled properly.

you should also take a look at “core redirectors” they could help.

DA-DA · May 27, 2025, 11:29pm

Thanks!!
Linker is reference.
The problem seems hard to solve.
I’ve reported it to epic, but no answers til now.

nande · May 27, 2025, 11:34pm

seems weird. have you tried the core redirectors?
good luck.

DA-DA · May 27, 2025, 11:47pm

It seems I haven’t changed the name of my class.
If use core redirectors, how to define the oldname and newname of grandchild BP and Component?

DA-DA · May 27, 2025, 11:51pm

And I reupgrade 54 to 55 and keep the config files as 54’s original settings in case of losing the core redirectors.
but the bug’s still there

nande · May 27, 2025, 11:53pm

like this

DA-DA · May 28, 2025, 12:15am

should be:

+ClassRedirects=(OldName=“BP_Grandchild.Sphere”,NewName=“BP_Grandchild.Sphere”)
?

nande · May 28, 2025, 12:58am

id go with
REINST_SKEL_BP_A_C_1377 to SKEL_B_C

though the actual name will be different. i don’t know exactly what.

DA-DA · May 28, 2025, 4:16am

1377 would change each time.
Should be
oldname=REINST_SKEL_BP_A_C,newname = SKEL_B_C ?