My application is built on .net framework 1.1 and Visual studio 2008. When I am accessing the report module of my application I am getting the error "Server error '/(report module' application.

My application is built on .net framework 1.1 and Visual studio 2008. When I am accessing the report module of my application I am getting the error "Server error '/(report module' application.

Parser Error
Description: An error occured during the parsing of a resource required to service this request...
 Parser Error Message: There is no build provider registered for the extension '.dll'...
 Source Error:
Line1: < Register Src="Reference/Dbauer.web.ui.webcontrols.HierarGrid.dll" Tagprefix="DBWC"  Tagname="dbwc" >

What does this error signifies ? I am able to generate the report on the Intranet but the same is failing while accessing through internet ? Please help to resolve this error.