oracle error -- ORA-00298: Missing or invalid attribute value

ORA-00298:	Missing or invalid attribute value
Cause:	A non-zero integer value is required when the following keyword attributes are specified: TIMEOUT, EXPIRE, DELAY, NEXT
Action:	Correct the syntax and retry the command.

oracle error -- ORA-00297: must specify RECOVER DATAFILE LIST before RECOVER DATAFILE START

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

ORA-00302:	limit of string logs exceeded
Cause:	The maximum number of redo log files has been exceeded.
Action:	Use the CREATE CONTROLFILE command with a larger value for MAXLOGFILES if the compatibility is lower than 10.2.0. Otherwise, allocate more storage space for the control file.