no valid navpoints Please tell me how to add navigation

log

000001.211| Loading Mission Data000001.211| 0/441 valid navpoints for 50 zombies at 112.658997 100.525803 120.997200000001.211| !!! no valid navpoints at 112.658997 100.525803 120.997200000001.225| Terrain3: Creating physics data000001.226| r3dTerrain3::UnpackHeightCached: unpacking (0,0) for [0]000001.240| Terrain3: Creating physics data - DONE!000001.240| WorldObjects: 3 + 127 static000001.240| server main loop started000001.240| net_mapLoaded_LastNetID: 1026000001.250| Job CJobGetServerObjects 0B22A1C8: Creating 0 objects000001.250| CJobGetSavedServerState, restoring state000001.250| 0 ItemSpawnPoints restored000001.250| time: 1, plrs:0/100, net_lastFreeId: 1026, objects: 3, async:0 0 0 0 000001.260| !!! r3d_assert 'gAutodeskNavMesh.GetWorld()' at .\Sources\ObjectsCode\Zombies\ZombieNavAgent.cpp line 23000001.260| !!! crashed, thread 2712000001.260| Creating minidump at logss\GS_300000bcb3792.dmp000001.439| Minidump created.

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Thank you for coming in. I hope you can help me.

- - - Updated - - -

Thank you for coming in. I hope you can help me.