what to do when i get this error? :

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Microsoft Development Environment
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The user control 'test.toolbar' could not be loaded. Ensure that the library containing the control has been built and a project reference has been made to the library containing the control. If you have changed the name of the user control, close and re-open the control's designer to update the toolbox item.
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OK
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i tried all the steps it says (i guess :P)