Game playing in editor but build remains black screen (UE 5.1)

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I created a custom map in the city sample project in UE5.0 for Windows. it worked fine both in editor and cooked. then i imported this map into city sample project in UE5.1. Now it plays well in the editor but build remains a black screen. attaching log
City51-backup-2023.04.19-14.23.15.log (696.7 KB)