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Unreal Engine 5 crashing when loading my level

Hey there,
my Unreal Engine is crashing when loading my main level.
I´ve reinstalled the Engine several times and it´s still not working.

Edit 1:
I thought maybe Unreal Engine cant find the File because I`ve installed it on my C: drive and it looks like the editor is searching for the file on my D: drive.

Edit 2:
I migrated it to an empty project and it works fine. All I had to do is loading all Object manually (World Partitioning)

Edit 3:
Sadly I realised that I can load every Actor but one. Its a Blueprint Class and it contains just a FBX File and a Material. Then I tried to delete it but if the actor is unloaded I´m not able to delete it. Then I deleted the complete Blueprint and every Texture and Material on it. But it´s not working. Is there any way to delete this Actor? I also realised that all Actors got unloaded when I restart the Editor.

I`ve just started with Unreal Engine and here´s the error:

LoginId:2180f0f24be6cfcaa381c78216e311e9
EpicAccountId:b604bfafe0ee440b97cb3bf65ef0d52f

Assertion failed: ActorPtr.IsValid() [File:D:/build/++UE5/Sync/Engine/Source/Runtime/Engine/Private/WorldPartition/WorldPartitionActorDesc.cpp] [Line: 279]

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