My user\'s Terminal Runs 2 application. One of which I built an application using VS 2005 with Crystal Reports bundled version and another outside product which uses a diffe
Here is one reason I got the error. I installed Crystal reports 11 version and the assembly in the GAC is 11.0.3300.0 (To check the version installed in your machine Windows+R => assembly). Screenshot/link below shows the version installed on my machine.

But in web.config of my code that I obviously checked out from my server is looking for crystal reports version 13.0.2000.0.
Solution: Renamed the version, PublickeyToken as per the installed crystal Reports version in my web.config. and this made my code running.