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Error while requesting math expression description #100
Description
Issue
Error while requesting a description of a math item
IO - inputCore.InputManager.executeGesture (17:21:03.172) - winInputHook (8204):
Input: kb(desktop):control+shift+rightArrow
ERROR - mathPres.MathCAT.MathCAT.MathCATInteraction._do_navigate (17:21:03.185) - MainThread (26088):
Traceback (most recent call last):
File "mathPres\MathCAT\MathCAT.pyc", line 159, in _do_navigate
OSError: Internal error: With en/ClearSpeak in Enhanced mode, can't DescribeNext from expression with id 'Mdszbjan-22' inside:
<math data-from-mathml='math' id='Mdszbjan-0' data-id-added='true' data-intent-property=''>
<mrow data-from-mathml='mrow' id='Mdszbjan-1' data-id-added='true'>
<mi data-from-mathml='mi' id='Mdszbjan-2' data-id-added='true'>x</mi>
<mo data-from-mathml='mo' id='Mdszbjan-3' data-id-added='true'>=</mo>
<fraction data-from-mathml='mfrac' id='Mdszbjan-4' data-id-added='true'>
<mrow data-from-mathml='mrow' id='Mdszbjan-5' data-id-added='true'>
<minus data-from-mathml='mrow' id='Mdszbjan-6' data-id-added='true' data-intent-property=':prefix:'>
<mi data-from-mathml='mi' id='Mdszbjan-8' data-id-added='true'>b</mi>
</minus>
<mo data-from-mathml='mo' id='Mdszbjan-9' data-id-added='true'>±</mo>
<square-root data-from-mathml='msqrt' id='Mdszbjan-10' data-id-added='true' data-intent-property=':function:'>
<mrow data-from-mathml='mrow' id='Mdszbjan-11' data-id-added='true'>
<power data-from-mathml='msup' id='Mdszbjan-12' data-id-added='true'>
<mi data-from-mathml='mi' id='Mdszbjan-13' data-id-added='true'>b</mi>
<mn data-from-mathml='mn' id='Mdszbjan-14' data-id-added='true'>2</mn>
</power>
<mo data-from-mathml='mo' id='Mdszbjan-15' data-id-added='true'>-</mo>
<mrow data-from-mathml='mrow' id='Mdszbjan-16' data-id-added='true'>
<mn data-from-mathml='mn' id='Mdszbjan-17' data-id-added='true'>4</mn>
<mo data-from-mathml='mo' id='Mdszbjan-18' data-id-added='true'>⁢</mo>
<mi data-from-mathml='mi' id='Mdszbjan-19' data-id-added='true'>a</mi>
<mo data-from-mathml='mo' id='Mdszbjan-20' data-id-added='true'>⁢</mo>
<mi data-from-mathml='mi' id='Mdszbjan-21' data-id-added='true'>c</mi>
</mrow>
</mrow>
</square-root>
</mrow>
<mrow data-from-mathml='mrow' id='Mdszbjan-22' data-id-added='true'>
<mn data-from-mathml='mn' id='Mdszbjan-23' data-id-added='true'>2</mn>
<mo data-from-mathml='mo' id='Mdszbjan-24' data-id-added='true'>⁢</mo>
<mi data-from-mathml='mi' id='Mdszbjan-25' data-id-added='true'>a</mi>
</mrow>
</fraction>
</mrow>
</math>
My config
- NVDA 2026.1beta9
- Windows 11 23H2 (AMD64) build 22631.6783
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[-]Error while navigating math expression[/-][+]Error while requesting math expression description[/+]NSoiffer commentedon Aug 11, 2026
When you say "description", can you be more precise about what you did?
CyrilleB79 commentedon Aug 11, 2026
I do not remember where I got this error. But this can be reproduced in various places.
Here is another example:
Enterto enter navigation mode; you land to "in root x"shift+control+spaceto read the description of the current item; here the error occursHere is the log:
nvda.log
NSoiffer commentedon Aug 12, 2026
Thanks. The overview/description code is very weak. But it should cause an error. Hopefully it is easy to fix.
CyrilleB79 commentedon Aug 12, 2026
What is very weak?
If you need more information, let me know which one.
As additional information, I am using
NSoiffer commentedon Aug 15, 2026
By "weak", I mean "not fully developed". It has some simple rules for giving overviews, but I think it needs substantial work to produce higher quality overviews.
FYI: You can use MathCAT as an addon. The latest build is at https://github.com/daisy/MathCATForPython/releases/tag/0.7.6-beta9. I think it is also in the beta channel for MathCAT on the addon store.