The CRA was unable to process your return. Our records indicate you are not filing an income tax return for the first time with the CRA. I'm sure it's my first time.

Most first-time filers are required to print and mail their returns as the information on your return must match information CRA has on file for you. If this is your first tax return (prepared by anyone), print your return and mail it to your tax office.

https://turbotax.community.intuit.ca/replies/2648070