Error message under CSS SCULPTOR 3.0.0
I have the same error message as you do. I tried to dig into the wacs_quickinsert.js and tried to comment out the function hasAutoSave() and subsequent lines in the if{} condition, but with NO SUCCESS. It generated new errors.
I think that the staff at WA is urged to correct this problem soonest and inform us so that we can take advantage of SCULPTOR 3.0.0.
Thks in advance for correcting this problem.