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I'm doing a MonoDevelop/Check for Updates and I get the exception below. I'm using an iMac running LION.
System.NullReferenceException: Object reference not set to an instance of an object
at MonoDevelop.Ide.Gui.BackgroundProgressMonitor+<OnProgressChanged>c__AnonStorey8C.<>m__109 (System.Object , System.EventArgs ) [0x00000] in /private/tmp/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/BackgroundProgressMonitor.cs:66
at Gtk.Application+InvokeCB.Invoke () [0x00000] in <filename unknown>:0
at GLib.Timeout+TimeoutProxy.Handler () [0x00000] in <filename unknown>:0
Fixed by the patch for bug #1355
We have verified this issue with MonoDevelop 2.8.5,it is working fine.
Kindly close this issue.