Message file RMAN.msb not found

Was getting below error when I ran rman


$ rman target /
Message file RMAN<lang>.msb not found
Verify that ORACLE_HOME is set properly


ORACLE_HOME was set correctly and other environments were set as well After looking further into this, we found the below files missing


$ORACLE_HOME/rdbms/mesg/rmanus.msg
$ORACLE_HOME/rdbms/mesg/rmanus.msb


Copied those two files from another working server and the issue got resolved.