How to Manage asp.net website with in asp.net website

Hi All,

i created 1 website in which i maintain 5 small website.

in menu bar i give to seperate application path and try to deploy on IIS 7 version but i couldn't do this. i face some errors like

Configuration Error
Line 20:       </assemblies>
Line 21:     </compilation>
Line 22:     <authentication mode="Forms">
Line 23:       <forms loginUrl="~/Account/Login.aspx" timeout="2880"/>
Line 24:     </authentication>

Note : In this 5 application 3 Application are Publish with PrecompiledApp.config file and each and every application give me same error.

Thanks in Advance.