If you’re seeing a ReCAPTCHA error, please ensure you’re using one of ReCAPTCHA’s supported browsers. Sometimes the issue is resolved simply when trying to submit at a later time, as multiple subsequent attempts to submit lower your ReCAPTCHA score.
Generally using Chrome and being logged in to your Chrome profile, not using incognito mode, and not having cookie blockers active on your browser should help. Clearing your cookies/cache might help too, but please bear in mind that your answers will be lost if you haven’t saved your application for later.