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CAD tip CAD tip # 11479:

Question CAD 
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Q - question

"Assertion failed" error when launching AutoCAD.

A - answer Launching AutoCAD leads to an (ignorable) error message "Assertion failed" in IsValidToAddQATItem.

This error is reported by Windows (the XML module) - the module may be damaged or the XML files of the AutoCAD CUI menu may be damaged. Please try to update the ACAD.CUIX file (from another PC, from a backup or from your installation media), or just perform a repair installation of your AutoCAD and (re)install the latest AutoCAD updates (service packs, hotfixes).

ACADLT
100% *  CAD 
16.6.2017    2606×  
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applies to: AutoCAD · AutoCAD LT ·

See also:
Tip 8482:How to convert CUI file to MNU or CUIX to CUI?
Tip 7896:AutoCAD displays an empty ribbon only.
Tip 7604:How to decompile a CUIX menu file?
Tip 4277:What are the .CUI files?
Tip 2410:How to export a XML file from AutoCAD?


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