Hi, we use Autofill (renamed to Lightning Autofill in v12) every day and have not had any issues creating new profiles. Please try these steps:
1. Back up your data to a CSV (Import/Export tab)
2. Reinstall Autofill
3. Try again
4. If it doesn't work, try installing in a different browser
If it still doesn't solve your issue, please submit a bug report on
Discord and we'll troubleshoot it.