I recently installed Basic Miktex installer and then texstudio. When I ran some already existing .tex file, it showed the error 'mathtools.sty not found'. I couldn't see any local repository option to install the missing package. I then tried to update Miktex console. But all of a sudden, the following message started to pop up repeatedly - 'The code execution cannot proceed because MikTex21000-ui-Qt.dll was not found. Reinstalling the program may fix this problem'. I tried uninstalling mike tex, but it showing the same message when I click on the app. I am using Windows 10. Can you please help me resolve the problem?

  • Unfortunately, mathtools is not installed by default. You have to install it with MiKTeX Package Manager.
    – Bernard
    Dec 5, 2021 at 17:42


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