Source files in an abnormal configuration leading to an error

Upon clicking the OK button of the first dialogue box, I am encountering an error: Tone.start is not a function. It has never happened before, so I went back to the already-built, older experiments that did not show this error and they are now showing this error as well.

My friend who also use Pavlovia for their experiment does not have this error. I then compared the source files under each of our experiment and found this (left = mine, right = friend’s):

I can see that this error comes from the core.js file and Tone comes from the Tone.min.js file. Why is my Tone.min.js file (along with other files) not in place for whatever changes that have been made to how core.js is called?

Thank you.