asp.net - Unable to find server tag -


i working on old project has user controls. on website 1 of these controls being called this: 

<form id="frmdesignation" runat="server" >   <table><tr><td>     <sidenav:menu runat="server" id="mymenu"></sidenav:menu>   </td></tr></table> </form>

at top user control has been registered: 

<%@ register tagname="menu" tagprefix="sidenav" src="~/common_uc/menu_sidenav.ascx"%>

but getting 

error   543 unknown server tag 'sidenav:menu'

the user control in right place, else seems fine. missing something?

update: gbs mentioned in comment, problem in uc itself. had build error in may that's why getting error message (i can't test now, don't have code :( )

mainly 2 things:

1: there issue uc itself.

2: might want try rebuilding project.


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