The virtual path 'xxx' maps to another application, which is not allowed.

I created a project that contains 4 separate UserControls. Within this project I have a WebForm in which I drag all 4 UserControls onto and compile. This all works fine. However, when I add another UserControl from a co-worker onto this same WebForm and compile I receive the following error:

Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: The virtual path 'xxx' maps to another application, which is not allowed

Can anyone help???

Thanks in advance.
TazsterAsked:
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jnhorstCommented:
If I am not mistaken, ascx user controls can only be used within the application into which they were built.  If you want true reusability, a "composite control" (a type of custom control that consists of multiple standard controls - like a textbox above a dropdownlist), would be a much better way to go.

John
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claygarrettCommented:
Can you post the code of the ascx file?  Or at least the first part of it?
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