[I replied privately, but reposting here in case others hit this]
I haven't seen this happen before. Is your facebook account associated with a different domain than Facebook.com? When that error comes up in Fishbowl it's supposed to open an external browser at the URL that you were being redirected to. Can you post what
The code is attempting to exit Fishbowl if you click Cancel or click on an ad in one of the facebook pages that takes you outside of the login workflow, but if Facebook is doing something unexpected with their redirects then you'd hit this.