Unable to add an event due to Fatal error: Class 'JToolbarHelper...

Hello,

I'm having another problem with the site currently. I am unable to add an event on the calendar at the front end or edit an existing post. The fatal error I receive is: Fatal error: Class 'JToolbarHelper' not found in /home/womenabo/public_html/cms/wab2.5/components/com_jevents/views/icalevent/view.html.php on line 60
(when attempting to edit a post)

or

Fatal error: Class 'JToolbarHelper' not found in /home/womenabo/public_html/cms/wab2.5/components/com_jevents/views/icalevent/view.html.php on line 66
(when trying to add a new event to the calendar)

As I mentioned in my previous post, I've already updated Jevent for the fix, to no avail.
Do you think you could shed some light on this problem? It seems to be a hot topic but I'm unable to find a resolution to it.

Regards,
D. Ashley