yum check-update command outputs 'yum died with exit status 100' in Red Hat Enterprise Linux

Issue

• When I executed yum check-update command, it outputs the following message.

yum died with exit status 100

• Returning 100 by the command should be no problem upon the man page.

       check-update
              Implemented so you could know if your machine had any updates that needed  to  be  applied
              without  running  it interactively. Returns exit value of 100 if there are packages avail‐
              able for an update. Also returns a list of the packages to  be  updated  in  list  format.
              Returns  0  if no packages are available for update. Returns 1 if an error occurred.  Run‐
              ning in verbose mode also shows obsoletes.