Issue with Twitter button

Every time I try to Tweet something using this plugin, I get this failure message:

“The change you wanted was rejected.
Maybe you tried to change something you didn’t have access to.”

The other buttons seem to be working just fine, though.

Anyway, you can see what I’m talking about here:

http://www.rjkoehler.com/travelog/2012/11/autumn-post-1-baegyangsa-temple/

Any help would be appreciated.

http://wordpress.org/extend/plugins/sexybookmarks/