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How to recover from this kind of startup error without reinstalling Mathematica?

  • $\begingroup$ The instructions say "Contact technical support ... for more information". Have you tried that? $\endgroup$
    – QuantumDot
    Nov 18 '17 at 23:20
  • $\begingroup$ I don't contact them. I don't have a service package plus, I tried in the past and the turnaround time is just too long for me. If I can't figure out by end of day, I'll just reinstall. $\endgroup$
    – qazwsx
    Nov 18 '17 at 23:21
  • $\begingroup$ Before reinstall, try deleting the folder /Users/<usrname>/Library/Mathematica and open Mathematica. If that doesn't work, then reinstall. $\endgroup$
    – QuantumDot
    Nov 18 '17 at 23:41