here is another message :
SyntaxError: identifier starts immediately after numeric literal
http://localhost:50000/preview.js, line 1 (col 0)
different message, noway to run preview of the project. I did'nt made any change since 2 weeks ago, when all my project was running with no problem on preview
i dont think is a C2 related bug, more of a plugin/behavior bug, either u installed or modified a plugin or behavior either u have something incomplete in behaviors and plugins.
also, the localhost:5000/preview.js only applies to you not for everybody, or atleast ur version of preview.js is in ur computer on localhost:5000 while on my computer the localhost:5000/preview.js shows my preview.js not yours.