Hi Vaibhavi, Try switching to the latest version of the client library. Also, make sure that your App.config matches the one that comes with the library - especially this line: http://code.google.com/p/google-api-adwords-dotnet/source/browse/trunk/src/AdWords/App.config#73
Let me know if this solves your problems. Basically, it is some object throwing an exception in its constructor, and a bad App.config is the usual reason. Cheers, Anash P. Oommen, AdWords API Advisor. -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and discussion group: http://adwordsapi.blogspot.com http://groups.google.com/group/adwords-api =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en