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Old June 5th, 2008, 09:19 AM
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planoie planoie is offline
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The error message you posted has to do with the AJAX framework, not so much with master pages. So I imagine that the problem with your line of code has to do with the way page callbacks are handled. Perhaps try setting a breakpoint on that line of code and see in what cases it gets called. Perhaps it's not getting called on an AJAX callback, although I don't see why that would be.

-Peter
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