The referenced script on this Behaviour (Game Object 'drone.deployed') is missing!
NullReferenceException: Object reference not set to an instance of an object
at Construction.AttributeSetup (UnityEngine.GameObject rootObj, System.String name, System.Boolean serverside, System.Boolean clientside, System.Boolean bundling) [0x00025] in <a34e7683b69f4178abf09c977fe4da3e>:0
at PrefabAttribute.PreProcess (IPrefabProcessor preProcess, UnityEngine.GameObject rootObj, System.String name, System.Boolean serverside, System.Boolean clientside, System.Boolean bundling) [0x000c1] in <a34e7683b69f4178abf09c977fe4da3e>:0
at PrefabPreProcess.ProcessObject (System.String name, UnityEngine.GameObject go, System.Boolean resetLocalTransform) [0x001bc] in <a34e7683b69f4178abf09c977fe4da3e>:0
at PrefabPreProcess.Process (System.String name, UnityEngine.GameObject go) [0x0003a] in <a34e7683b69f4178abf09c977fe4da3e>:0
at GameManager.FindPrefab (System.String strPrefab) [0x0002a] in <a34e7683b69f4178abf09c977fe4da3e>:0
at FileSystem_Warmup.PrefabWarmup (System.String path) [0x00000] in <a34e7683b69f4178abf09c977fe4da3e>:0
at FileSystem_Warmup+<Run>d__4.MoveNext () [0x00100] in <a34e7683b69f4178abf09c977fe4da3e>:0
at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <0b31faaf1c50461d95c83ac166a20393>:0

Your server is not updated fully.

ok, thank you!