Ubuntu 16.04 LTS \n \l

Linux ra 4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:08:35 UTC 2016 i686 i686 i686 GNU/Linux

rick@ra:~$ dpkg -l mono-complete
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  mono-complete  4.2.1.102+df i386         complete Mono runtime, developmen



[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidOperationException: Cannot call Invoke or BeginInvoke on a control until the window handle is created
  at System.Windows.Forms.Control.FindControlToInvokeOn () <0xb037bf00 + 0x000c3> in <filename unknown>:0 
  at System.Windows.Forms.Control.Invoke (System.Delegate method, System.Object[] args) <0xb037be50 + 0x00017> in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:Invoke (System.Delegate,object[])
  at System.Windows.Forms.Control.Invoke (System.Delegate method) <0xb037bcf0 + 0x000a7> in <filename unknown>:0 
  at GMap.NET.TilePrefetcher.OnTileCacheStart () <0xb1062b08 + 0x000af> in <filename unknown>:0 
  at GMap.NET.GMaps.CacheEngineLoop () <0xaea825e0 + 0x000bb> in <filename unknown>:0 
  at System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) <0xb54a5280 + 0x00088> in <filename unknown>:0 
  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, Boolean preserveSyncCtx) <0xb54a3980 + 0x0016b> in <filename unknown>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, Boolean preserveSyncCtx) <0xb54a3940 + 0x00033> in <filename unknown>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) <0xb54a3890 + 0x0005a> in <filename unknown>:0 
  at System.Threading.ThreadHelper.ThreadStart () <0xb54a5400 + 0x00039> in <filename unknown>:0