Hello Raju. I don't know if you still having the issue, but to get the account hierarchy: http://code.google.com/p/google-api-adwords-dotnet/source/browse/trunk/examples/csharp/v201109/AccountManagement/GetAccountHierarchy.cs -- begins at line 84
One issue I was having here with the same error message: In the configuration file, the ClientCustomerId and ClientEmail keys was not commented, and the application ignored all the values that I set. Commenting the configuration file, everything worked. Hope that helps. Cheers -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ 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