I have a lot of error I do not understand, when I try to load my custom map

Exception (cs:58632): NullReferenceException: Object reference not set to an instance of an object.
AdaptMeshToTerrain.Adapt () (at <00000000000000000000000000000000>:0)
AdaptMeshToTerrain.OnEnable () (at <00000000000000000000000000000000>:0)
GameManager.CreatePrefab (System.String strPrefab, System.Boolean active) (at <00000000000000000000000000000000>:0)
PrefabPoolWarmup.PrefabWarmup (System.String path) (at <00000000000000000000000000000000>:0)
PrefabPoolWarmup+<Run>d__1.MoveNext () (at <00000000000000000000000000000000>:0) UnityEngine.SetupCoroutine.InvokeMoveNext
(System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)
GameManager:CreatePrefab(String, Boolean)
PrefabPoolWarmup:PrefabWarmup(String) <Run>d__1:MoveNext() UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
(18:36:31) | Rust:IO> Failed to update server information: NullReferenceException Object reference not set to an instance of an object
at RustIO.Interface.c () [0x0004f] in <9bc97477b8ea4fb5adfcc45270cb3e45>:0

HELP ?