ORA-00257: archiver error. Connect internal only | Automatic archival Disabled

Then as root switch to this user so have to have all the oracle variables in your path,

You MUST log on as sysdba that's the only internal user allowed to access the database in such situations. eg if the owner owner/user is oradba

# su - oradba

Now you can invoke sqlplus

$sqlplus /nolog
SQL>conn / as sysdba

SQL> archive log list;
Database log mode        Archive Mode
Automatic archival        Enabled
Archive destination        USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     482
Next log sequence to archive   482
Current log sequence        487

Check the Archive destination and delete all the logs

SQL> shutdown immediate
Database closed.
Database dismounted.

SQL> startup mount
ORACLE instance started.

Total System Global Area 3240239104 bytes
Fixed Size     2217712 bytes
Variable Size 2835351824 bytes
Database Buffers   385875968 bytes
Redo Buffers    16793600 bytes
Database mounted.

SQL> alter database noarchivelog;
Database altered.

SQL> alter database open;
Database altered.

SQL> archive log list;
Database log mode        No Archive Mode
Automatic archival        Disabled
Archive destination        USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     482
Current log sequence        487

You should see Automatic archival Disabled