Thanks for your response. The Error screen related to "Error before Start()" has been fixed. But now I am in another weird problem where it is not allowing to debug. It is throwing " Error Communicating with Debugger.Runtime will continue Debugging".
I checked exception log it is showing "Type System.Runtime.Remoting.ObjRef and the types derived from it (such as System.Runtime.Remoting.ObjRef) are not permitted to be deserialized at this security level."
Earlier i had 8.0.1053 installed in my system but the application which I am trying to debug is currenlty on 8.0.1025 version So I have uninstalled 1053 and installed 1025 (not sure if that is the reason!). Could you please advise me ?