The file that's trying to be included is from JFBConnect 2.6. Is that the version you installed, or are you using 3.0.0?
Unless you want to use 2.6 for some reason, we'd recommend you upgrade to 3.0. 2.6 shouldn't have that fatal error, and we'll gladly help you debug it if you want to continue using it. However, 3.0 is just a lot better.
To upgrade from 2.6 to 3.0, please check out our configuration guide. It's pretty simple:
www.sourcecoast.com/extensions/jfbconnec...onnect-upgrade-guide