Did you installed an update of the Multisites Content Module ?
Did you tried to purge the converted files ?
On which version of Joomla did you get this error ?
The error message is a Joomla error message.
So I need more detailled (very detailled) information on the environement and conditions to reproduce the problem.
The error seems to mean that "PATH_COMPONENT_ORIGINAL" would not be defined by an extension (that is unknows).
So try provide a cleared detailled scenario to reproduce the problem.
If you want that we have a look in your server and try add a debug trace to identify which extension cause this error, this is possible with our billable support that you can order at
www.jms2win.com/download?page=shop.produ...35&category_id=1