Rainbow Portal Community

I am trying search portal option in Admin tab.. for articles its working fine.. but for othe modules like MIlestone,Task etc.. its throwing an exception. Milestone exception : Could not load file or assembly 'file:///D:\Portal Management\Rainbow 2.0\newAlpha3\WebSites\Rainbow\bin\App_Web_wsykhcjt.DLL' or one of its dependencies. The system ...