Can not su – root. su: incorrect password

I am trying to switch to root user using the su command. I am getting the following error $ su – root Password: su: incorrect password I checked the /var/log/messages and found the following: Dec 9 17:04:27 vSBC_OMM_L audispd: node=vSBC_OMM_L type=USER_AUTH msg=audit(1575929067.716:33815689): user pid=5855 uid=503 auid=0 ses=39383 subj=unconfined_u:unconfined_r:unconfined_t:s0 msg=’op=PAM:authentication acct=”root” exe=”/bin/su” hostname=? addr=? terminal=pts/0 res=failed’…