I cannot export

I cannot export cards and I always get this message:
Anki 2.1.49 (dc80804a) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=False sv=2
Add-ons, last update check: 2022-04-11 21:22:32

Caught exception:
Traceback (most recent call last):
File “aqt\taskman.py”, line 101, in _on_closures_pending
File “aqt\taskman.py”, line 71, in
File “aqt\exporting.py”, line 173, in on_done
File “concurrent\futures_base.py”, line 432, in result
File “concurrent\futures_base.py”, line 388, in _get_result
File “concurrent\futures\thread.py”, line 57, in run
File “aqt\exporting.py”, line 167, in do_export
File “anki\exporting.py”, line 342, in exportInto
File “anki\exporting.py”, line 350, in doExport
File “anki\exporting.py”, line 253, in exportInto
File “anki\models.py”, line 539, in update
File “anki_backend\generated.py”, line 450, in add_or_update_notetype
File "anki_backend_init
.py", line 131, in _run_command
anki.errors.TemplateError: La plantilla de tarjeta ⁨2⁩ tiene un problema.
The front side is identical to card template ⁨1⁩.

Como dice el mensaje, La plantilla de tarjeta ⁨2⁩ tiene un problema, el anverso es idéntico al reverso.

Corrigiendo esa plantilla deberías poder exportar sin problemas.

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Some more info: Checks and Errors - Anki Manual