When applying for Ride-to-Work, if you exit the process before completion the application will pause, you will not be able to start a new one.
You should be emailed a link to go back in to resume your application, however if you keep receiving an error, please ask your HR team to login to their portal to 'cancel' your original application.
This will allow you to apply again from the beginning. A helpful guide for how to navigate this portal can be found here.