ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

SYS@PROD1> alter database archivelog;
alter database archivelog
*
ERROR at line 1:
ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

Elapsed: 00:00:00.22

SYS@PROD1> alter database open;

Database altered.

Elapsed: 00:00:06.84
SYS@PROD1> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SYS@PROD1> startup mount;
ORACLE instance started.

Total System Global Area  732352512 bytes
Fixed Size		    1347456 bytes
Variable Size		  322961536 bytes
Database Buffers	  406847488 bytes
Redo Buffers		    1196032 bytes
Database mounted.

SYS@PROD1> alter database archivelog;

Database altered.

Elapsed: 00:00:00.03