Dave,
Interesting question. The difference could be because MyEclipse 2024 is based on Eclipse 2024-03, using the corresponding version of WWD too. You’re using a more recent version of Eclipse (and hence, of WWD), and there could be additional validation in this release. We are currently working on a MyEclipse update that will be based on Eclipse 2024-09 – this will be MyEclipse 2024.2, scheduled for later this year.
An additional note is that we make some changes to WWD as well; some changes to fix bugs, some to improve functionality or simply to make it compatible with the other tooling in MyEclipse. Coming to the error itself, I’m afraid we can’t comment without actually seeing the error / type of error. If the file is a standalone JS file, you could consider pasting it into an online validator for further comparison.
Hope this helps.