ora-00257:archiver error. Connet internal only,until freed.

sqlplus sys/12345678 as sysdba

SQL> show parameter db_recovery

SQL> alter system set db_recovery_file_dest_size =4G;

rman target /

backup archivelog all;

backup archivelog all delete all input;

crosscheck archivelog all;

delete expired archivelog all;

delete backup;