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We've had situations when Yahoo's had technical glitches and we haven't been able to submit sites to them. Usually, we wait for a few hours and they seem to come back.
I've never seen this particular error before. Maybe you should try waiting to see if later today or tommorrow it works. If not, the best thing I can think of is for you to send them an email and inform them of the technical difficulty? Unfortunately, that's the best idea I can think of right now.
Good luck!