The source code comes from a multi-lingual assembly: one module is in J#, other parts are in C#. Build221 JetBrains.ReSharper.Util.InternalErrorException: Object reference not set to an instance of an object. An exception has occurred during request execution ---> System.NullReferenceException: Object reference not set to an instance of an object. at JetBrains.dotTrace.SourcePreview.SourceViewerControl.UpdateStripsFromRange() in C:\TEMP\tmp3AB4.tmp\src\Components\src\SourcePreview\impl\SourceViewerControl.cs:line 797 at JetBrains.dotTrace.SourcePreview.SourceViewerControl.UpdateSignature(UpdateSignatureMode mode) in C:\TEMP\tmp3AB4.tmp\src\Components\src\SourcePreview\impl\SourceViewerControl.cs:line 750 at JetBrains.dotTrace.SourcePreview.SourceViewerControl.set_SignatureContainer(ISignatureContainer value) in C:\TEMP\tmp3AB4.tmp\src\Components\src\SourcePreview\impl\SourceViewerControl.cs:line 92 at JetBrains.dotTrace.UIModel.UI.SignatureView.SourceViewManager.UpdateSignature() in C:\TEMP\tmp3AB4.tmp\src\UIModel\src\UI\SignatureView\SourceViewManager.cs:line 98 at JetBrains.ReSharper.Util.Alarm.OnTimer(Object sender, EventArgs e) in c:\Agent\work\ReSharper2.0\src\Shell\src\Alarm.cs:line 202 — End of inner exception stack trace — at JetBrains.ReSharper.Util.Logger.LogExceptionEx(Exception, String, Boolean) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 327 column 9 at JetBrains.ReSharper.Util.Logger.LogException(String, Exception) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 344 column 5 at JetBrains.ReSharper.Util.Alarm.OnTimer(Object, EventArgs) in c:\Agent\work\ReSharper2.0\src\Shell\src\Alarm.cs:line 206 column 15 at System.Windows.Forms.Timer.OnTick(EventArgs) at System.Windows.Forms.TimerNativeWindow.WndProc(Message&) at System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG&) at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32, Int32, Int32) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32, ApplicationContext) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32, ApplicationContext) at System.Windows.Forms.Application.Run(Form) at JetBrains.dotTrace.PocketTasks.RunMainFormTask.Execute() in C:\TEMP\tmp3AB4.tmp\src\dotTrace2\src\PocketTasks\RunMainFormTask.cs:line 17 column 3 at JetBrains.dotTrace.MainStuff.Main(String[]) in C:\TEMP\tmp3AB4.tmp\src\dotTrace2\src\MainStuff.cs:line 24 column 6