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.
Error
An error occurred. Please use Tools > Check Database to see if that fixes the problem.
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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/webview.py”, line 493, in handler
File “aqt/editor.py”, line 483, in
File “aqt/addcards.py”, line 190, in _addCards
File “aqt/editor.py”, line 597, in saveAddModeVars
File “anki/models.py”, line 87, in save
File “anki/models.py”, line 231, in update
File “anki/rsbackend_gen.py”, line 414, in add_or_update_notetype
File “anki/rsbackend.py”, line 267, in _run_command
anki.rsbackend.InvalidInput: InvalidInput { info: “attempt to save stale notetype” }