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Recovering a project which crashes at Startup

I am new to unreal engine, and i started using Unreal Engine 5.
I am using Unreal Engine 5.0 EA2.
Everything was fine till this evening, when my project suddendly crashed.
Then, i cannot open it again : it crashes at startup.

I’ve tried to remove the CachedAssetRegistry.bin in
C:\Users–\Documents\Unreal Projects\HorseBkup\Intermediate
but it did not help.

What shall i do to recover my work ?

  • i uninstalled and reinstalled Unreal Engine 5.0 : it didn’t help
  • I don’t know which files from my project i can remove to see if i can import it again
  • I didn’t find a way to import the content folder into a new blank project that i created.

Message at startup

LoginId:--
EpicAccountId:--

Assertion failed: UnderlyingArchive.IsSaving() || UnderlyingArchive.IsCountingMemory() [File:D:/build/++UE5/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/Class.cpp] [Line: 1510]

UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_Core
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_Core
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Landscape
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_Core
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_Landscape
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_DetailCustomizations
UnrealEditor_DetailCustomizations
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_MainFrame
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Replying to myself for newbie like me.
I created a blank project, and then copy paste the content folder of my corrupted project, to the content project of the empty one. It worked