1. Always switch to fusionSF.js or fusion.js in your fusion template index.html and retry. fusionSF-compressed.js is optimized for production, not for debugging/diagnosing errors. Errors thrown by fusionSF-compressed.js are next to meaningless.
2. When retrying open up your browser developer tools (F12) and observe the network requests/responses. The SyntaxError is most likely because an AJAX request for JSON data returning something that is not JSON, most likely meaning some server-side error has occurred.