#6 Working on an exam

[piffus]

as i tried to work on an exam, i got the following msg:

An exception of type 'System.InvalidOperationException'
occurred and was caught.
--------------------------------------------------------------------------------
03/15/2006 23:05:20
Type : System.InvalidOperationException, mscorlib,
Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089
Message : This BackgroundWorker is currently busy and
cannot run multiple tasks concurrently.
Source : System
Help link :
Data : System.Collections.ListDictionaryInternal
TargetSite : Void RunWorkerAsync(System.Object)
Stack Trace : at
System.ComponentModel.BackgroundWorker.RunWorkerAsync(Object
argument)
at
SmartAssign.UI.UserClient.Views.StandardAssignmentController.AddSolution(StudentStandardSolution&
solution, String path)
at
SmartAssign.UI.UserClient.Views.StandardAssignmentView.btnAddSolution_Click(Object
sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at
System.Windows.Forms.Button.OnMouseUp(MouseEventArgs
mevent)
at System.Windows.Forms.Control.WmMouseUp(Message&
m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&
m)
at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&
m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Additional Info:

MachineName : DESKTOP
TimeStamp : 15.03.2006 22:05:20
FullName :
Microsoft.Practices.EnterpriseLibrary.ExceptionHandling,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=null
AppDomainName : DefaultDomain
ThreadIdentity : DESKTOP\Jan
WindowsIdentity : DESKTOP\Jan

[Hannes Pavelka]

Logged In: YES
user_id=1469795

Can you please provide steps how to reproduce this error?