Error when upgrading to Virtualmin Pro

I just tried to upgrade to Virtualmin Pro and got the following error message:-

==========================================
Creating Virtualmin license file ..
.. done

Clearing YUM caches ..
.. done

Upgrading Virtualmin RPM packages :

Loading "installonlyn" plugin
Error: Need to pass a list of pkgs to install
usage: yum [options] < grouplist, localinstall, groupinfo, localupdate, resolvedep, erase, deplist, groupremove, makecache, upgrade, provides, shell, install, whatprovides, groupinstall, update, groupupdate, info, search, check-update, list, remove, clean, grouperase >

options:
-h, --help show this help message and exit
-t, --tolerant be tolerant of errors
-C run entirely from cache, don't update cache
-c [config file] config file location
-R [minutes] maximum command wait time
-d [debug level] debugging output level
-e [error level] error output level
-y answer yes for all questions
--version show Yum version and exit
--installroot=[path] set install root
--enablerepo=[repo] enable one or more repositories (wildcards allowed)
--disablerepo=[repo] disable one or more repositories (wildcards allowed)
-x [package], --exclude=[package]
exclude package(s) by name or glob
--obsoletes enable obsoletes processing during updates
--noplugins disable Yum plugins
None
.. done

Some errors occurred while upgrading your system to Virtualmin Pro. Please check the messages above for possible causes.
==========================================

My concern is that I am not sure what state the upgrade is in so I am holding off doing anything with the server so I do not complicate the current setup.

Regards,

Michael Walker

Status: 
Closed (fixed)