Standalone game crashes

Assertion failed: false || !FScopedAllowAbstractClassAllocation::IsDisallowedAbstractClass(InClass, InFlags) [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 2436]

Hello Fortnite_Kenzo1, and welcome to the Unreal community.

Thank you for posting part of your error. Can you please go to the Saved folder of your built project and look over the logs that were generated? Generally here, you can see more on the error. Feel free to post the error from your logs so we may better understand your current concern.

I look forward to your reply.

The problem is solved somehow.