World Partition Convert Weird Error

[SilentSandMan]

Hello there,

I have a level that was created in UE 5.1 and contained 3 landscapes and foliage painted on them. I have to convert it to World Partion in UE 5.3. I migrated the level into UE 5.3 empty project and when I try to convert it to World Partition I have this weird message box:

This is my log file:

I tied everything. I watched all related videos and tested all methods but I don’t know what should I do. I will be grateful if somebody can help me.

Thanks

[SilentSandMan]

I kind of fixed the Issue. It’s related to landscape physical material error that couldn’t be fixed by “Build Landscape” or " Build Grass Maps Only".

So, I returned to the primary version in UE 5.1 and converted the main landscapes to World Partitions without any problem. Then I migrate it to the UE 5.3.

I still have the same landscape physical material issue but at least on a World Partitioned map and HLOD build working fine with it. in UE 5.3