Build Failed [UE 5.5.2] Ensure condition failed: DefaultStructInstance.IsValid()

Development Programming & Scripting
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1

Hey!
Ever since i updated to unreal engine 5.5.2 i’m getting this error when making a build:

LogOutputDevice: Error: begin: stack for UAT
LogOutputDevice: Error: === Handled ensure: ===
LogOutputDevice: Error:
LogOutputDevice: Error: Ensure condition failed: DefaultStructInstance.IsValid() && DefaultStructInstance.GetStruct() == this  [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\StructUtils\UserDefinedStruct.cpp] [Line: 476]
LogOutputDevice: Error:
LogOutputDevice: Error: Stack:
LogOutputDevice: Error: [Callstack] 0x00007ffbcfdc11ad UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfdcee9f UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc15e44 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbd01bad88 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbd01c6214 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbd018cae8 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfdb36e9 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfdd0183 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4e4f9 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff36dad UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfde0033 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcbb8e53b UnrealEditor-Engine.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbc7e2c466 UnrealEditor-UMG.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7eb03 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28a23 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc10485 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed53 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc290a6 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc290a6 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28a23 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc10485 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed53 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2892f UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc10485 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed53 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28a23 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc10485 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc1047d UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed53 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28fa7 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc28a23 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc10485 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed53 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc29018 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff7ed48 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4eb17 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcff4fefb UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ffbcfc2ad12 UnrealEditor-CoreUObject.dll!UnknownFunction []
LogOutputDevice: Error:
LogOutputDevice: Error: end: stack for UAT

i cannot for the life of me understand why.
Here’s what i’ve tried:
Renaming all the structs in the projects.
Revalidating all assets
Deleting Binaries | Build | DerivedDataCache | Saved | .VSconfig
Updating VS
Changing Setting in the build settings.

can someone please help me?

2

I was not able to fix. and every struct i change brakes Building. i even made a new project, and as soon as you make a struck with a map | Struct2 and change the struct2 the engine gives that errors when building.

So the solution?
duplicate the project, open the project2 make the struct changes there, and then copy the UASSETs to the original project.
BUT ONLY THE STRUCTS
and them spend the next 3 days remaking lost code
Huzzah for BP structs