Hi,
Please have a look on below.
http://www.ryanjones.io/2011/07/21/crm2011-error-occurred-while-fetching-the-data-extension/
http://mscrmnovice.blogspot.in/2013/04/how-to-fix-error-while-fetching-data.html
Thanks!
Kalim Khan
Hello,
Also please ensure that in SSRS configuration, CRM administrator User should have full privileges in SQL server too. Have you checked that?
Thanks
Abhishek Bakshi