asp .net chart control problem

This error will come when a reference is specified in web.config and deployment folder/site does not contain these dlls installed in the system or bin folder does not contain them(if they are private assemblies).
<add assembly="Namespace1.NameSpace2, Version=x.x.x.x, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
If your web.config contains any assemblies like this and deployed server doesnot contain these assembiles in bin or GAC, then this error will occur.

Ref:http://forums.asp.net/t/956297.aspx/2/10?Web+Deployment+Project+quot+has+not+been+pre+compiled+quot+[^]