[Mono-winforms-list] Object reference not set to an instance of an object at System.Windows.Forms.XEventQueue+PaintQueue.Dequeue ()

[Joao Paulo Rodrigues]

Hi All

I'm trying to port a C# application to MONO at Linux.

All is working now (better than in windows) except for the ocasional crash
at: System.Windows.Forms.XEventQueue+PaintQueue.Dequeue () .

(Complete Stack trace bellow).

The nature of the application makes this a terrible problem, because the
error is only catchable outside of the form (main thread), so I have no
option but to terminate the aplication.

Can't figure out what the cause can be. All reports of this on the
Internet appear has bugs, with no corrections indicated.

Can anyone help?

I'm running Ubuntu 10.04 kernel 2.6.32-28 and Mono 2.6.7-3 ubuntu1~dh from
badgerPorts


Thanks in advance for any help.


Program Error:Object reference not set to an instance of an object

  at System.Windows.Forms.XEventQueue+PaintQueue.Dequeue () [0x00000] in
<filename unknown>:0
  at System.Windows.Forms.XplatUIX11.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr handle, Int32 wFilterMin, Int32
wFilterMax) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.XplatUI.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr hWnd, Int32 wFilterMin, Int32
wFilterMax) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.Application.RunLoop (Boolean Modal,
System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run (System.Windows.Forms.Form
mainForm) [0x00000] in <filename unknown>:0
  at Xarevision.Program.Main () [0x00000] in <filename unknown>:0

or


Program Error:List has changed.

  at System.Collections.ArrayList+SimpleEnumerator.MoveNext () [0x00000]
in <filename unknown>:0
  at System.Windows.Forms.XEventQueue+PaintQueue.Dequeue () [0x00000] in
<filename unknown>:0
  at System.Windows.Forms.XplatUIX11.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr handle, Int32 wFilterMin, Int32
wFilterMax) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.XplatUI.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr hWnd, Int32 wFilterMin, Int32
wFilterMax) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.Application.RunLoop (Boolean Modal,
System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run (System.Windows.Forms.Form
mainForm) [0x00000] in <filename unknown>:0
  at Xarevision.Program.Main () [0x00000] in <filename unknown>:0


__________________________________________________
João Paulo Rodrigues

XAREVISION Lda.  	 Url: www.xarevision.pt

R. Dr Roberto Frias 378  E-mail: jpr at xarevision.pt
4200 - 465 Porto         Tel.:   + 351 22 2094065
                         Mobile: + 351 93 3206764
			 Fax:    + 351 22 2094246