Issue on DPA Schedule reports

Trying to create a Client specific report.  Able to Test the report and it is generating normally.  However, unable to schedule the same and pops up with the error message as 'An Error has occured while attempting to create the Scheduled report'. 

I'm trying to schedule the report through main Menu - File --> Scheule Report as I'm unable to see the client list under the Backup server when I try to create the same through Report Editor. 

Please help..