[HELP] Zombie Spawn Crash

000002.580| r3dTerrain3::UnpackHeightCached: unpacking (4,6) for [4]
000002.581| r3dTerrain3::UnpackHeightCached: unpacking (4,7) for [5]
000002.628| r3dTerrain3::UnpackHeightCached: unpacking (5,5) for [6]
000002.630| r3dTerrain3::UnpackHeightCached: unpacking (6,5) for [7]
000002.632| r3dTerrain3::UnpackHeightCached: unpacking (7,5) for [8]
000002.636| r3dTerrain3::UnpackHeightCached: unpacking (5,6) for [9]
000002.638| r3dTerrain3::UnpackHeightCached: unpacking (6,6) for [10]
000002.640| r3dTerrain3::UnpackHeightCached: unpacking (7,6) for [11]
000002.643| r3dTerrain3::UnpackHeightCached: unpacking (5,7) for [12]
000002.646| r3dTerrain3::UnpackHeightCached: unpacking (6,7) for [13]
000002.648| r3dTerrain3::UnpackHeightCached: unpacking (7,7) for [14]
000002.687| Terrain3: Creating physics data - DONE!
000002.687| WorldObjects: 27 + 1389 static
000002.687| server main loop started
000002.687| net_mapLoaded_LastNetID: 1026
000002.689| Connecting to gameblocks server at port
000002.701| time: 2, plrs:0/25, net_lastFreeId: 1026, objects: 27, async:0 0 0 0
000002.715| Job CJobGetServerObjects 087464E8: Creating 0 objects
000002.715| !!! r3d_assert 'gAutodeskNavMesh.GetWorld()' at .\Sources\ObjectsCode\Zombies\ZombieNavAgent.cpp line 23
000002.715| !!! crashed, thread 3948
000002.715| Creating minidump at logss\GS_20000060e2b57.dmp
000002.857| Minidump created.

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How to give them navigation on the map? I do not understand.