Error in using Simple Facebook Connect plugin

I am using ‘Simple Facebook Connect‘ wordpress plugin for my blog. When I post new content, on right side bar it shows following error:

If you can see this, then there is some form of problem showing you the Facebook publishing buttons. This may be caused by a plugin conflict or some form of bad javascript on this page. Try reloading or disabling other plugins to find the source of the problem.

I tried to disable other plugins but still get same problem.
Can somebody give me suggestion on it?

http://wordpress.org/extend/plugins/simple-facebook-connect/