Hi Jose,
Not sure wether its related query or not.
By seeing your error,
Please check your bw server connection during query execution.
If your checking at web portal, please check your portal address and retry with correct one.
Tx - RSUDO - is to check authorization for particular user on bex report.
can you try to check your bex query at RSRT and let us know if you face any problems there.
For authorisation issues check with basis for your user id, Tx - SU01, RSECADMIN.
Thanks