I have use Devcomponent tool for design.
Last night i have copied controls and have edited some changes. And now
ANY TIME I debug my program show :
Code:
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Microsoft Visual Studio
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The control DevComponents.DotNetBar.NavigationBar has thrown an unhandled exception in the designer and has been disabled.  



Exception:

The file D:\PROGRAM\RESTAURANT\HQ2\HQ\QLBH1.0\Mainform\Trangchu.vb cannot be modified in the designer while building or debugging.



Stack trace:

   at DevComponents.DotNetBar.NavigationBarContainer.RecalcSize()

   at DevComponents.DotNetBar.NavigationBar.RecalcSize()

   at DevComponents.DotNetBar.NavigationBar.OnHandleCreated(EventArgs e)
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OK   
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Have you met that error ?

I click OK and program still fine.
But when i change the designer file then that msbox is shown.
How can i fix it ?