Hello ,
LoginId:f5d05ce74fe96a27fc61d6a503b7191a
Assertion failed: (Parameters.DestClass->GetPropertiesSize() >= Parameters.SourceObject->GetClass()->GetPropertiesSize()) [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 2859] Source and destination class sizes differ. Source: SparseDelegateFunction (288) Destination: Function (264)
UnrealEditor_CoreUObject!StaticDuplicateObjectEx() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:2856]
karfone
June 25, 2023, 12:06am
2
Same error for me. I got the error after updating to 5.2.1 from 5.2. Compiling a specific actor in my project crashes the editor. I can make changes, save and restart before compiling to bypass the crash for now. I can duplicate the actor class and compile the duplicate without crashing as well.
I’m not sure how to recreate the bug to report it though. Looking through any other actors that reference it, maybe related to spawning the actor.
Assertion failed: (Parameters.DestClass->GetPropertiesSize() >= Parameters.SourceObject->GetClass()->GetPropertiesSize()) [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 2859] Source and destination class sizes differ. Source: SparseDelegateFunction (288) Destination: Function (264)
UnrealEditor_CoreUObject!StaticDuplicateObjectEx() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:2856]
UnrealEditor_CoreUObject!StaticDuplicateObject() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:2848]
UnrealEditor_Kismet!<lambda_1c92e0a06f96968232baf1ea8a546af9>::operator()() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:2965]
UnrealEditor_Kismet!FBlueprintCompilationManagerImpl::FastGenerateSkeletonClass() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:3075]
UnrealEditor_Kismet!FBlueprintCompilationManagerImpl::FlushCompilationQueueImpl() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:1000]
UnrealEditor_Kismet!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:287]
UnrealEditor_Kismet!FBlueprintCompilationManager::CompileSynchronously() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:3370]
UnrealEditor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:763]
UnrealEditor_Kismet!FBlueprintEditor::Compile() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\BlueprintEditor.cpp:4085]
UnrealEditor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,1,void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:292]
UnrealEditor_Slate!FUICommandList::ExecuteAction() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:111]
UnrealEditor_Slate!SToolBarButtonBlock::OnClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SToolBarButtonBlock.cpp:384]
UnrealEditor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,1,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:275]
UnrealEditor_Slate!SButton::ExecuteOnClick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:465]
UnrealEditor_Slate!SButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:390]
UnrealEditor_Slate!<lambda_51e270ca99ea7ce852539efd04dd453f>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5129]
UnrealEditor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_51e270ca99ea7ce852539efd04dd453f> >() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:420]
UnrealEditor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5115]
UnrealEditor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5684]
UnrealEditor_Slate!FSlateApplication::OnMouseUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5649]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2219]
UnrealEditor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2726]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1895]
UnrealEditor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:925]
karfone
July 5, 2023, 8:14am
3
Decided to build from source and customize the error message in UObjectGlobals.cpp (line 2856) to give some more detail.
checkf( (Parameters.DestClass->GetPropertiesSize() >= Parameters.SourceObject->GetClass()->GetPropertiesSize()),
TEXT("Source and destination class sizes differ. Source: %s (%i) Destination: %s (%i), Destname: %s"),
*Parameters.SourceObject->GetClass()->GetName(), Parameters.SourceObject->GetClass()->GetPropertiesSize(),
*Parameters.DestClass->GetName(), Parameters.DestClass->GetPropertiesSize(), *Parameters.SourceObject->GetName());
Turns out it was referencing a bind to event. In my case, I had bound an event to TakeRadialDamage. I deleted the bind and the event it was originally bound to. I then recreated the bind and the event and compiled.
2 Likes
I have exactly same issue. But I have zero knowledge of c++
Can you please tell me in steps what should I do to avoid that assertion failed source destination class size differ crash error on most blueprints?
DuneGames
October 26, 2023, 11:45am
5
Thank you karfone!
Note for others: If running the game from VisualStudio, it ‘crashes’ to the right location to change this code. Next time it broke, it went to another location which gave me the name of the bind event that was causing the error via a CreateEvent node.
Just as karfone says, though I did it slightly different by recreating another duplicate node, putting it next to the other and ctrl+click dragging the pins over to the new node before deleting the old. And making sure the new node was properly selected in the CreateNode. It compiled without issue from there. (So nice not to have the crash anymore!)
eSnapple
April 11, 2024, 1:28pm
6
After bumping a project from 4.27 to 5.3, I had the exact same issue with a blueprint component that had binds listening to point, radial, and any damage on the owner. It would crash with the same error on compile. After deleting those binds/events, it compiled just fine. Thanks for the tip!