data studio 3.1 cannot backup DB2 10.1

Hi,

When I used Data Studio 3.1 to backup a 10.1.0 DB2 database, with options of " File System, Full backup", it failed with the following error:

Failed to execute command. DAS returned the following error: sqlcode=-22204 output=null

Can anybody gives me a clue what's wrong here ?

Thanks,
Dixie