World Partition doesn't work on the existing level (UE 5.4)

Development World Creation
,
3

Hii @SupportiveEntity ! Thanks for helping out :white_heart:
Here is a screenshot of the settings I used and the Full Log. Hope this will give you more information about this issue.

Settings

Error01
Error013800×59 17.3 KB

Error02
Error022544×370 127 KB

Full Log Output.txt (941.5 KB)