SYS password has expired and cannot be changed due to ORA-00257: Archiver error

**In the past** : When I had once the error ORA-00257: Archiver error, I had resolved it using the RMAN command: rman target sys/1234 delete archivelog all; **This time** , **when I try to connect to rman target**: rman target sys/1234 I get the error: RMAN-00554: initialization of internal recovery manager packagefailed. RMAN-04005: error from target database. ORA-28001:the password has expired. **When I try to connect with sqlplus as sys SYSDBA**, then raises the following error: ERROR: ORA-28001: the password has expired Changing password for SYS New password: **When I type the new password**, the error that comes is: ORA-00257: Archiver error. Connect AS SYSDBA only until resolved. So the problem is that.. - When I connect through sqlplus as sys SYSDBA, I cannot change the expired sys password because of archivelog RMAN. - When I try to fix RMAN error, I cannot connect to RMAN due to the expired sys password. How can I solve this?