Can you double check that you've setup the Open Graph action in the Facebook Application interface properly? Since the error states "Unknown Component Path", it means that Facebook isn't aware of the action your trying to post. Please make sure you've followed the steps for setting up an Action in our guide:
www.sourcecoast.com/jfbconnect/docs/open...ions/action-creation
You need to setup the Action in the Facebook Developer area and then JFBConnect is able to post that action on the user's behalf.
If you haven't gone through that guide yet, I'd recommend looking at all the steps.
We don't currently support actions for JomSocial Events yet, but it's planned for a future release.
I hope that helps answer your questions,
Melissa