Solving Weird Facebook Error 191 in IE7

I was doing some QA for a Facebook application the other day. I encountered a strange error message that only occurred in IE 7, but not in any other browsers that I tested against with (Firefox, Chrome, Safari, perhaps IE >= 8 too).

Adding a channel file fixed the problem:

Make sure that channel.html is accessible from the current page where the "init" script is.

If you encounter this problem and running out of solutions, it's worthwhile to give this a try.

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