Try these solutions:
Reset Illustrator Preferences ( https://helpx.adobe.com/illustrator/using/setting-preferences.html) help to resolve the issue? If doesn't work, try the next one.
Rename the CEP folder to CEP.old from the following location: C:\Program Files (x86)\Common Files\Adobe If doesn't work, try the next one.
Rename the extensions folder to extensions.old in the following location: C:\Program Files\Common Files\Adobe\UXP If doesn't work, try the next one.
Uninstall the application using the CC Cleaner tool and reinstall from the Creative Cloud Desktop app.
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