Why does the message BC30560 'mymodule_ascx' is ambiguous in the namespace 'ASP' come up sometimes then go away?
<p>Often when making changes to a VS2008 ASP.net project we get a message like:</p>

<p>BC30560: 'mymodule_ascx' is ambiguous in the namespace 'ASP'.</p>

<p>This goes away after a recompile or sometimes just waiting 10 seconds and refreshing the page. </p>

<p>Any way to get rid of it?</p>
