Hello,

I have this weird bug that happening again on my server. It happens only when I had a Military Base on my map (with MLRS).
After a restart of my server, when fully rebooted I noticed my console being flood with this error (or warning) message:

Server Exception: Mountable Cycle
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 39)

NullReferenceException: Object reference not set to an instance of an object
at MLRS.TryGetAimingModule (Item& item) [0x00006] in <8d2b90ef026a4e9ab11aa89cffe712be>:0
at MLRS.VehicleFixedUpdate () [0x00044] in <8d2b90ef026a4e9ab11aa89cffe712be>:0
at BaseMountable.FixedUpdateCycle () [0x00039] in <8d2b90ef026a4e9ab11aa89cffe712be>:0
at ServerMgr.FixedUpdate () [0x00018] in <8d2b90ef026a4e9ab11aa89cffe712be>:0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception, Object)
ServerMgr:FixedUpdate()

(Filename: <8d2b90ef026a4e9ab11aa89cffe712be> Line: 0)​

The 1st time I had this issue was on my local test server, which I quickly fixed with a workaround (deleting the MLRS, and spawn a new one...) but doing so mess up with the monument after a reboot. (buildings and NPC didn't spawn anymore). It was on my local server for test so I didn't pay much attention, but now it is happening on my prod server.
It spam so much errors that it is impossible to connect on it, and therefore to apply any workaround in game.

Is there any know issue about MLRS or compatibility with a plugin? Am I alone?
When this bug happened on my local server, even restarting the server without any plugins would cause the same issue.
Is there anybody that can help on this matter please?

So far the only fix I know, and it is a temp one, is to wipe...

Thank you.


Edit:
After few reboots and tentatives, I was able to connect on the server.
I'm now in-game; I see that all players buildings has disappeared, and trees not at the same place... like a map wipe. Can it have a link between the save and quit command being executed manualy without giving enought time to "save" to execute? Sound weird but I see nothing else that I have done to cause this stat.

Edit2:
After searching in the logs, I also found this error that never came before this issue. (it spam 9k lines in my logs, with different stream position)

Skipping entity since it could not be deserialized - stream position: 4481 size: 478 
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 39)

NotImplementedException: Unknown wire type: 7
  at SilentOrbit.ProtocolBuffers.ProtocolParser.SkipKey (System.IO.Stream stream, SilentOrbit.ProtocolBuffers.Key key) [0x0006b] in <900bd4dd56324018986e258b1d72bc05>:0 
  at ProtoBuf.IOEntity.DeserializeLengthDelimited (System.IO.Stream stream, ProtoBuf.IOEntity instance, System.Boolean isDelta) [0x001ab] in <900bd4dd56324018986e258b1d72bc05>:0 
  at ProtoBuf.IOEntity.DeserializeLengthDelimited (System.IO.Stream stream) [0x00006] in <900bd4dd56324018986e258b1d72bc05>:0 
  at ProtoBuf.Entity.DeserializeLength (System.IO.Stream stream, System.Int32 length, ProtoBuf.Entity instance, System.Boolean isDelta) [0x00b91] in <900bd4dd56324018986e258b1d72bc05>:0 
  at ProtoBuf.Entity.DeserializeLength (System.IO.Stream stream, System.Int32 length) [0x00006] in <900bd4dd56324018986e258b1d72bc05>:0 
  at SaveRestore.Load (System.String strFilename, System.Boolean allowOutOfDateSaves) [0x0018d] in <8d2b90ef026a4e9ab11aa89cffe712be>:0 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
SaveRestore:Load(String, Boolean)
ServerMgr:Initialize(Boolean, String, Boolean, Boolean)
<StartServer>d__19:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
 
(Filename: <900bd4dd56324018986e258b1d72bc05> Line: 0)

This error happened after 

AIInformationZone performing complete refresh, please wait...
Map Spawned 1827 entities
Destroying 2005 old entities
1264 / 2005
Calling kill - but already IsDestroyed!? vending_mapmarker[0]

followed by

Failed to create agent because there is no valid NavMesh
Missing RelationshipManager - creating
Navmesh Source Collecting took 216.73 seconds
Starting Monument Navmesh Build with 704 sources
RuntimeNavMeshBuilder: Source mesh structure_bottom_COL is skipped because it does not allow read access

After that it seems pretty normal.
For my perspective, it looks like my map sav files is corrupted. So, is it really related to the save command?
I don't have much hope, but if the proceduralmap.sav is corrupted, is there any way to restore that ? because I did some reboots, so I'm not sure I will be able to recover a good backup, and I still not scheduled a server backup... (will do this from now )

Hi Hiroshi-- have the exact same problem on our server as well just this morning.  Did you ever find a solution?  Has it happened again since?

i haveing this problem and my server is uptodat did this have a fix 

Warkingz

i haveing this problem and my server is uptodat did this have a fix 

I had this occur on one of my servers and nothing solved it except regenerating the map.

I researched this problem a lot. The problem is related to not being able to get into the MLRS vehicle.
I removed the MLRS truck from the map with the admin remover tool. Then I restarted the server. and I spawned the MLRS truck again with the command "spawn mlrs.entity".

In this way, I solved this error without performing a wipe. It no longer gives 10 errors per second or any other error on the console.
There is no other way to solve this on the internet right now.
I hope this solution is useful to everyone.

For those coming here from Google just run

del assets/content/vehicles/mlrs/mlrs.entity.prefab​

in your server cmd to stop the spam. That's right the error, "Server Exception: Mountable Cycle" has nothing to do with the peddle or motor bikes on your server. Then get on your server in player mode, go to the military site, and use

spawn mlrs.entity

in the F1 menu as you are looking at the dirt circle the looks different from the rest of the sand.