I am having an issue open/previewing/editing my site. I am able to open my muse doc ok, but as soon as I try editing or previewing my site, I get the error message.
Well, could you try describing, as said also in the error message, the last actions you made before encountering the error?
I just opened the document and tried to preview it. Hadn't opened it since the day before. I get the error anytime I try to preview (shift+cmd+e) or view a breakpoint.
Many appologies to find you in this trouble.
However, would you mind sharing your .muse file with us so that we can investigate and try fixing it.
For sharing the file you can follow the steps explained here - https://forums.adobe.com/docs/DOC-8652 and send the link to me in a private message.
To do a private message hover the mouse on my picture and click "message".
It's been 3 weeks and still no support. I am just remaking it from scratch, and hopefully, I won't have to seek "help" this time around.