UE5.6 Crash when upgrading project

[TheSimpleShark]

Hello!

I am trying to migrate my project from UE5.2 to UE5.6 but I keep getting an error. This has been associated with a lot of assets like widgets, character, and I've tried deleting a lot and its just endless failed references. And it's too much work to recreate my main character and main widget since its referenced in hundreds of places, so how would I resolve this issue?

I've tried disabling the plugin, deleting it entirely, rebuilding it manually like I did with a couple other plugins but it wont build for UE5.6 for me.

Error: Assertion failed: !Object->HasAnyFlags(RF_NeedLoad | RF_NeedInitialization) [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 10517]
[2025.09.01-03.09.14:978][640]LogWindows: Error: Object='BP_SimpleAI_MasterProjectile_C /Game/AI_Erasers/Projectiles/BP_SimpleAI_MasterProjectile.Default__BP_SimpleAI_MasterProjectile_C' (00000201EC7F3200), Flags=Public | ClassDefaultObject | ArchetypeObject | NeedLoad | WasLoaded, InternalFlags=0x04508000

Here's my full log:
Stickman.log

[truong-bui]

Hi @TheSimpleShark,
This is not related to the Async Loading Screen plugin. The logs posted above are from asynchronous loading assets. Also, most of the issues from your logs are due to missing Blueprint references. You should check if all your Blueprint classes are actually loaded/imported to 5.6 in the content browser.