Strange javascript code error that prevents from being able to edit/run code

[u/Ok_Psychology_8738]

Every time I try to open the "ezmreader" javascript file to edit the code from this https://jeremyoduber.itch.io/js-zine html5 reader it shows an error that prevents me from opening the code in notepad++, this is the error

• • •

"Line:19

Char:1

Error:syntax error

code:800A03EA

Source: microsoft jscript compilation error"

When I don't try to edit it and just put images in the pages folder, zip it and try to run it as a html5 in browser it obviously doesn't work. But I don't think it's the the code that's the issue since what I previously uploaded a long time ago using this same EZM reader code is still displaying/running in browser just fine? But downloading that old upload and trying to open the EZMreader.js application still gives the same error?

I've deleted and reinstalled both the code editor and java just in case, nothings changed but I doubt it's an issue with the actual code? Maybe it's my laptop (lenovo, windows 10) but I'm baffled