Error when added to workflow

[anonymous]

When I add TicketWorkflowNotifier to the workflow i get the following error accessing any page on my trac project.

Cannot find implementation(s) of the ITicketActionController interface named TicketWorkflowNotifier. Please check that the Component is enabled or update the option [ticket] workflow in trac.ini.

I read through the bug list and saw where someone got similar issues, but the difference is that I have modified the workflow from the original options. But here is the only ticket-workflow-notifications section entry I have:

[ticket-workflow-notifications] owner_changed = * owner_changed.body = Ticket owner changed by ${change.author}: ${change.comment}\n\n{% for field in old_ticket %}{% if old_ticket[field] != ticket[field] %}\n${field} changed: ${old_ticket[field]} => ${ticket[field]}{% end %}{% end %} owner_changed.recipients = ${ticket.owner} owner_changed.subject = You are now the owner of ticket ${ticket.id}! owner_changed.condition = ${old_ticket.owner != ticket.owner}