How do I fix 'Uncaught SyntaxError: Unexpected token'?

After I make any scripts on one of my projects and clicking start, it will load for a little bit and then show the words, “Uncaught SyntaxError: Unexpected token” followed by the first letter of the script. How do I fix this?

Is it possible you pasted in the link to the code editor page for your script into your script component?

The URL used in the script component should be relative. In most cases just the filename: e.g. myfile.js