# Fatal Error. What do I do?

**URL:** <https://forums.ankiweb.net/t/fatal-error-what-do-i-do/41308>\
**Category:** Help\
**Created:** [February 19, 2024, 8:05am UTC](https://forums.ankiweb.net/t/fatal-error-what-do-i-do/41308 "2024-02-19T08:05:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![michelleee](https://avatars.discourse-cdn.com/v4/letter/m/e8c25b/32.png) [@michelleee](https://forums.ankiweb.net/u/michelleee)\
**Post date:** [February 19, 2024, 8:05am UTC](https://forums.ankiweb.net/t/fatal-error-what-do-i-do/41308/1 "2024-02-19T08:05:11Z")

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Hi, I’m not really sure what’s happening but it just says to put it on the forums

A fatal error occurred, and Anki must close. Please report this message on the forums.  
Anki 23.10.1 (fac9e0ee) Python 3.9.15 Qt 6.6.0 PyQt 6.6.0  
Platform: Windows-10-10.0.22631  
Flags: frz=True ao=True sv=?  
Add-ons, last update check: 2024-02-19 18:15:57

Caught exception:  
Traceback (most recent call last):  
File “aqt.taskman”, line 138, in \_on\_closures\_pending  
File “aqt.taskman”, line 82, in   
File “aqt.taskman”, line 102, in wrapped\_done  
File “aqt.operations”, line 122, in wrapped\_done  
File “concurrent.futures.\_base”, line 439, in result  
File “concurrent.futures.\_base”, line 391, in \_\_get\_result  
File “concurrent.futures.thread”, line 58, in run  
File “aqt.operations”, line 107, in wrapped\_op  
File “aqt.operations.note”, line 22, in   
File “anki.collection”, line 534, in add\_note  
File “anki.\_backend\_generated”, line 1225, in add\_note  
File “anki.\_backend”, line 152, in \_run\_command  
pyo3\_runtime.PanicException: assertion `left == right` failed  
left: 1708329698956  
right: 0

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<div class="post-metadata">

**Author:** ![Danika\_Dakika](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/danika_dakika/32/17815_2.png) [@Danika\_Dakika](https://forums.ankiweb.net/u/Danika_Dakika)\
**Post date:** [February 19, 2024, 9:06am UTC](https://forums.ankiweb.net/t/fatal-error-what-do-i-do/41308/2 "2024-02-19T09:06:01Z")

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The best place for you to start is the Troubleshooting checklist – [Troubleshooting - Anki Manual](https://docs.ankiweb.net/troubleshooting.html) . That will help to quickly narrow down where the issue is coming from.

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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:** [March 20, 2024, 9:06am UTC](https://forums.ankiweb.net/t/fatal-error-what-do-i-do/41308/3 "2024-03-20T09:06:02Z")

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