The javascript editor is displaying error messages, did something change recently in the newest beta? with the linting?
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so the game starts up fine, no console errors, its just the editor reporting back false positives, also the highlighting of the same selected word, also highlights white space which looks a bit weird, will fill bug for this later.
Looks like the error markers in the text editor aren't being cleared, it isn't normally possible to see more than 1 syntax error because the JS parser we use stops once it hits an error. Opening and closing the text editor should clear any invalid markers. I'll take a look at it.
I've looked at it and it was a simple typo in a recent QOL feature. Fixed for the next beta release.