# A fatal error occurred, and Anki must close

**URL:** <https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408>\
**Category:** Help\
**Created:** [February 6, 2022, 11:32pm UTC](https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408 "2022-02-06T23:32:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![leandrog](https://avatars.discourse-cdn.com/v4/letter/l/278dde/32.png) [@leandrog](https://forums.ankiweb.net/u/leandrog)\
**Post date:** [February 6, 2022, 11:32pm UTC](https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408/1 "2022-02-06T23:32:52Z")

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A fatal error occurred, and Anki must close. Please report this message on the forums.  
Anki 2.1.48 (fb07bad3) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2  
Platform: Windows 10  
Flags: frz=True ao=False sv=?  
Add-ons, last update check: 2022-02-05 18:48:40

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\operations\_init_.py", line 214, in wrapped\_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\operations\_init.py", line 199, in wrapped\_op  
File “aqt\editor.py”, line 540, in   
File “anki\notes.py”, line 191, in fields\_check  
File “anki\_backend\generated.py”, line 355, in note\_fields\_check  
File "anki\_backend\_init_.py", line 126, in \_run\_command  
pyo3\_runtime.PanicException: called `Result::unwrap()` on an `Err` value: PoisonError { … }

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**Author:** ![SA\_NFTX](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@SA\_NFTX](https://forums.ankiweb.net/u/SA_NFTX)\
**Post date:** [February 6, 2022, 11:32pm UTC](https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408/2 "2022-02-06T23:32:57Z")

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A fatal error occurred, and Anki must close. Please report this message on the forums.  
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=?  
Add-ons, last update check: 2022-02-06 13:18:55

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\operations\_init_.py", line 214, in wrapped\_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\operations\_init.py", line 199, in wrapped\_op  
File “aqt\editor.py”, line 544, in   
File “anki\notes.py”, line 191, in fields\_check  
File “anki\_backend\generated.py”, line 355, in note\_fields\_check  
File "anki\_backend\_init_.py", line 126, in \_run\_command  
pyo3\_runtime.PanicException: called `Result::unwrap()` on an `Err` value: PoisonError { … }

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**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\
**Post date:** [February 7, 2022, 11:26am UTC](https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408/3 "2022-02-07T11:26:17Z")

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Please run from a console - another error should be shown first in the console:

[https://docs.ankiweb.net/platform/windows/startup-issues.html#debugging](https://docs.ankiweb.net/platform/windows/startup-issues.html#debugging)

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**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\
**Post date:** [May 1, 2023, 4:32am UTC](https://forums.ankiweb.net/t/a-fatal-error-occurred-and-anki-must-close/17408/4 "2023-05-01T04:32:39Z")

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