REHEL6 Errors

Hello,
Thank you for this great plugin but, when I use it with RHEL6 systems, it give me errors
UNKNOWN: Security plugin for yum is required. Try to ‘yum install yum-security’ and then re-run this plugin. Alternatively, to just alert on any update which does not require the security plugin, try –all-updates even with installing the required package.
and in some other RHEL6 systems it give me

YUM WARNING: Cannot find summary line in yum output. Please make sure you have upgraded to the latest version of this plugin. If the problem persists, please contact the author for a fix

Thanks