Hello, i have recently upgraded my project from 5.4 to 5.7 ( i made a copy )
Everything seems to work fine, exept only the default level is working.
When i try to open any other level made with 5.4, the editor instantly crashes.
It seems to be a issue with the layer info for the landscape, it says there is an error in a cpp file, but i cannot find it and even then, i will have no clue what to change to fix the issue.
Also the wierd thing is the level that works fine have some heavy landscape on it with multiple layers and everything works just fine.
Another wierd thing ; In my level that is working, i have a TP zone to enter other levels, and if i use this to transition to another level in game, it works fine ! the level loads without issues and i can play on it, but opening the EXACT same level from the content drawer instantly crashes unreal.
Here is the error log :
Script Stack (0 frames) :
[2026.06.04-09.44.11:863][ 73]LogWindows: Error: appError called: Assertion failed: InPair.Value.LayerInfoObj->GetLayerName() == InPair.Key [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\Landscape.cpp] [Line: 7526]
[2026.06.04-09.44.11:863][ 73]LogWindows: Windows GetLastError: L’opération a réussi. (0)
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: === Critical error: ===
[2026.06.04-09.44.13:490][ 73]LogWindows: Error:
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: Assertion failed: InPair.Value.LayerInfoObj->GetLayerName() == InPair.Key [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Landscape\Private\Landscape.cpp] [Line: 7526]
[2026.06.04-09.44.13:490][ 73]LogWindows: Error:
[2026.06.04-09.44.13:490][ 73]LogWindows: Error:
[2026.06.04-09.44.13:490][ 73]LogWindows: Error:
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe75a28448 UnrealEditor-Core.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe7207bd2e UnrealEditor-Landscape.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe720600a0 UnrealEditor-Landscape.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe720bf7de UnrealEditor-Landscape.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe72140360 UnrealEditor-Landscape.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe6cc86667 UnrealEditor-Engine.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe6db6fe34 UnrealEditor-Engine.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe6db7088e UnrealEditor-Engine.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe6db9b0e7 UnrealEditor-Engine.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe6ebe50f4 UnrealEditor-Engine.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe66bd7295 UnrealEditor-UnrealEd.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe66bdd915 UnrealEditor-UnrealEd.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe66bbe1b4 UnrealEditor-UnrealEd.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe7863890a UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe7864b75e UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe78139369 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe7813904c UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe78566c9d UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe78565f85 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe7856655d UnrealEditor-CoreUObject.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe2dd2c21a UnrealEditor-ContentBrowserAssetDataSource.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe2dd1cb63 UnrealEditor-ContentBrowserAssetDataSource.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe2dd1cef9 UnrealEditor-ContentBrowserAssetDataSource.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe2dcfad1b UnrealEditor-ContentBrowserAssetDataSource.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe59b4264c UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe59af4618 UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe59a2313e UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe599e37c1 UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe599dcfa8 UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe59a30dc8 UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe59a237ed UnrealEditor-ContentBrowser.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe74ede5f0 UnrealEditor-Slate.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe74f2774a UnrealEditor-Slate.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe74f1b1d2 UnrealEditor-Slate.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ffe74f128ba UnrealEditor-Slate.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff0c54ead9 UnrealEditor-ApplicationCore.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff0c53683a UnrealEditor-ApplicationCore.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff0c551ecf UnrealEditor-ApplicationCore.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff0c5300e1 UnrealEditor-ApplicationCore.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff3fc2ef5c USER32.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff3fc2e684 USER32.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff0c574a29 UnrealEditor-ApplicationCore.dll!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68ad947d9 UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68adb0bfe UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68adb0d0a UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68adb4590 UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68adc5be4 UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007ff68adc8f9a UnrealEditor.exe!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error: [Callstack] 0x00007fff3fb67374 KERNEL32.DLL!UnknownFunction []
[2026.06.04-09.44.13:490][ 73]LogWindows: Error:
[2026.06.04-09.44.13:492][ 73]LogExit: Executing StaticShutdownAfterError
[2026.06.04-09.44.13:500][ 73]LogWindows: FPlatformMisc::RequestExit(1, LaunchWindowsStartup.ExceptionHandler)
[2026.06.04-09.44.13:500][ 73]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, LaunchWindowsStartup.ExceptionHandler)
[2026.06.04-09.44.13:500][ 73]LogCore: Engine exit requested (reason: Win RequestExit)
Im really stuck here.
Thanks in advance.