emcli execute_sql

Hi,

I would like to user emcli execute_sql to get the data from a database UOEMGRID which has credential set and tested successfully. So I run:

$ emcli execute_sql -sql="select * from sysman.mgmt_targets;" -targets="UOEMGRID:oracle_database"  -credential_set_name="DBCredsSYSDBA"

Preferred Credentials do not exist for some targets.

Any idea why I get this error message? There is only a single UOEMGRID:oracle_database target in the repository, don't know what other targets it is talking about. Thank you in advance.