ERROR: NMO not setuid-root

When using Enterprise Manager, you might get the following error message:
If you get this error while using Enterprise Manager;

Problem:ERROR: NMO not setuid-root (Unix-only)

Solution:

$ su - root

$ cd $ORACLE_HOME/bin

$ chown root nmb nmhs nmo

$ chmod 6750 nmb nmhs nmo

Then restart the database:)