Probleme with navmesh

Development World Creation
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1

i put 2 NAVmest in my map and when a start game my NAVmesh bug i dont know why and is the same thing when i use one NAVmest for all map

look video to understand : ue4 navmesh - YouTube

2

294915-ue4-navmesh.png
294915-ue4-navmesh.png1288×714 142 KB

3

i have this error log