JFBConnect Installation Error

Thasi,
Sorry for the delay in responding to this post. I seemed to have missed it.

The JOAuth1Client is something that comes with Joomla 3.x itself and we load that automatically. Can you let me know what version of Joomla 3 you're using, and we can investigate further? It's possible there's something we're missing in an older version. Joomla 3.2 is the latest (but just came out last week). Joomla 3.1.6 was the most recent release before that, and is recommended if you're on 3.1.x. Joomla 3.0 is deprecated, and should not be used. There are multiple security issues and bugs in those releases, and the upgrade to 3.1 or 3.2 should be a 1-click upgrade.

Let me know, and we'll gladly help however we can.

Thanks,
Alex