Server error message when Jotting to Sandy

I always get a server error when Jotting to IwantSandy from my phone. Jott recognizes Sandy as an addressee, and says "Got it" after I finish dictating. I also get an SMS from Jott with the transcribed message, so that part seems to work. However, Sandy never gets the message, and the SMS from Jott says "server experienced an error" right below the message to Sandy.

No problem when I email directly to Sandy, though. So what's the problem?
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