All Oracle Error CodesOracle DBA Forum

ORA-00297:

must specify RECOVER DATAFILE LIST before RECOVER DATAFILE START
Cause: The RECOVER DATAFILE START command was issued, but no RECOVER DATAFILE LIST commands had been issued. This only happens when doing recovery with Recovery Manager, and is an internal error in Recovery Manager, because Recovery Manager should always issue RECOVER DATAFILE LIST before RECOVER DATAFILE START.
Action: Contact customer support