oracle error - ORA-00259: log string of open instance string (thread string) is the current log, cannot archive

ORA-00259:	log string of open instance string (thread string) is the current log, cannot archive
Cause:	An attempt was made to archive the current log of an open thread. This is not allowed because the redo log file may still be in use for the generation of redo entries.
Action:	Force a log switch in the instance where the thread is open. If no instances are open, open the database so that instance recovery can recover the thread.

oracle error - ORA-00258: manual archiving in NOARCHIVELOG mode must identify log

ORA-00258:	manual archiving in NOARCHIVELOG mode must identify log
Cause:	The database is in NOARCHIVELOG mode and a command to manually archive a log did not specify the log explicitly by sequence number, group number or filename.
Action:	Specify log by filename, by group number or by thread and sequence number.

ORA-00254:	error in archive control string 'string'
Cause:	The specified archive log location is invalid in the archive command or the LOG_ARCHIVE_DEST initialization parameter.
Action:	Check the archive string used to make sure it refers to a valid online device.