Getting an "invalid input" on all my cards in anki after syncing

I got the invalid input portion showing up on all my cards->went to check database->still showing it. Not sure what to do. Also whenever I try to use my anki app on the iPhone I can’t do any cards without it requesting me to upgrade to a V2 scheduler and force a one way sync.

The v1 scheduler is no longer supported in the latest Anki or AnkiMobile versions, so you will need to upgrade. Please follow the steps on this page: The Anki 2.1 scheduler - Frequently Asked Questions

There’s a decent chance those steps will also resolve the other issue you were encountering. If they do not, please include a screenshot of what you’re seeing or reproduction steps.