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This usually means that there is something on the form that is preventing you from submitting it or it could be caused by a required field that is missing information or a field with information entered in an invalid format. I highly recommend clearing the cache on your browser and re-submitting the registration form.
One of our community members faced a similar concern. I highly recommend going through this thread which will guide you to resolve this:
Feel free to reach out to us if you have any further queries.