[RHUI 3 ] rhui-manager command fails with 'raise exceptions.ApacheServerException(response_body)' error when trying to sync repositories.

Issue

• Unable to execute any command inrhui-manager tool, it shows an error.
  ------------------------------------------------------------------------------
  -= Red Hat Update Infrastructure Management Tool =-

  -= Synchronization Status =-
  
     dr  display repo sync summary
     vr  view the details of the last repository sync
     sr  sync an individual repository immediately
  
                                          Connected: rhua.example.com
  ------------------------------------------------------------------------------
          rhui (sync) => dr
  
  
  An unexpected error has occurred during the last operation.
  More information can be found in /root/.rhui/rhui.log.