Hi Roy,
These are unusual errors, we and other users have not experienced it before. The problem may be in your wp environment.
Please try to delete all WRI and Yarpp files and reinstall them, maybe there was an installation problem.
It is also possible to have a plugin collusion. Please deactivate other plugins and check if the problem still exists or not.
If the problem stil exists, please let us know it.
Thanks in advance.
Peter Rath
Webshoplogic