If you get a strange error message when you post a comment, don't worry. Most likely your comment has gotten through and the error message has no purpose. (Actually it has the purpose of confusing people into thinking their comment didn't post. But it has no useful purpose.)
I'm using the Movable Type 4 beta and, well, it's still a beta. I just noticed this error message when I upgraded to beta version 6 a couple of days ago. I have a bug report in and the good news is that they are responding to bug reports. At least the ones I've sent have all gotten speedy responses. I hope they'll have beta version 7, without the superfluous error message, within a few days.
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