oracle error -- ORA-00296: maximum number of files (string) exceeded for RECOVER DATAFILE LIST

ORA-00296:	maximum number of files (string) exceeded for RECOVER DATAFILE LIST
Cause:	The RECOVER DATAFILE LIST command specified more datafiles than are allowed by the DB_FILES initialization parameter. This error occurs when doing recovery with Recovery Manager, and the instance has been started with a DB_FILES parameter specifying fewer datafiles than recovery manager needs to recover to satisfy the user's RECOVER command.
Action:	Re-start the instance with a higher value for DB_FILES.

oracle error -- ORA-00295: datafile/tempfile number string is invalid, must be between 1 and string

ORA-00295:	datafile/tempfile number string is invalid, must be between 1 and string
Cause:	An invalid file number was specified.
Action:	Specify a valid datafile or tempfile number and retry the operation.

ORA-00294:	invalid archivelog format specifier 'string'
Cause:	An invalid format specifier was found in the LOG_ARCHIVE_FORMAT initialization parameter. The only characters permitted following the % symbol are s, S, t, and T.
Action:	Correct the initialization file and re-start the instance.