help - Finding a syntax error in a jsx file - just getting a dialog

I

I'm starting to debug my first Premiere Pro Panel

When my panel opens up (and also after I refresh it) I get a dialog box saying Exception:SyntaxError: Expected: ;

- so - I've got a syntax error in one of my ExtendScript  jsx (application) files - but how can I see where it is ?

I'm using both the chrome remote debug, andthe extendscripto toolkit but it's happening from within the call to CSInterface.prototype.evalScript, and neith of these tools picks up a problem of any sort

I tried to load the file into a normal chrome browser -  but it did not complain about any problem at all

Thanks

Yonatan