Error Occurred.. I'm Confused

The tab that popped up is below this note. I have never used Anki before but the only thing I did was click add, change the type to basic(and reversed card), then type in the front and back sections.

An error occurred. Please use Tools > Check Database to see if that fixes the problem.
If problems persist, please report the problem on our support site. Please copy and paste the information below into your report.
Anki 2.1.34 (8af8f565) Python 3.8.0 Qt 5.15.1 PyQt 5.15.1
Platform: Mac 10.15.6
Flags: frz=True ao=False sv=1
Add-ons, last update check: 2020-09-28 22:34:05

Caught exception:
Traceback (most recent call last):
File “aqt/”, line 493, in handler
File “aqt/”, line 483, in
File “aqt/”, line 190, in _addCards
File “aqt/”, line 597, in saveAddModeVars
File “anki/”, line 87, in save
File “anki/”, line 231, in update
File “anki/”, line 414, in add_or_update_notetype
File “anki/”, line 267, in _run_command
anki.rsbackend.InvalidInput: InvalidInput { info: “attempt to save stale notetype” }

Have you already tried this? Tools > Check Database. Does it help?

That looks like a bug, but I can’t seem to reproduce the issue when taking those steps. If you force Anki closed and repeat your steps, does it happen again?

Yeah I have, it doesn’t work ;-;