I was getting this error today, for some unknown reason, and obviously debugging it is of no use, as the brightspark that declared everything as "a", "b" or "c" obviously didn't want us to!
Anyway, after some searching around on my page, I found that a modalpopupextender that I have added to my page, had an invalidad cancelcontrolid, I had mis-spelled it, and therefore this error must be because "a" in this instance was the control that was to be used to close (cancel) the popup.
The joys of using other peoples code....
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