Reposting for any who might have missed it:

ATTENTION IF YOU ARE USING NO-SCRIPT!!

I was having these same error issues, but I was able to get through by allowing scripts globally in No Script. A site from a secondary source will open up within MogStation, and you aren't given the chance to allow those scripts before Mog Station errors out. Give this a try, there is a good chance it will solve your problem!

Best of luck!