The error comes up on Outlook; when opened can be due to non-updation of the latest version.
Once removed, check by reopening Microsoft Outlook to see if the error has been resolved. If the error continues, go to choose the third option and solve the issue. Once done, one should log out of the Microsoft Outlook accounts. Sometimes, having more than one email application can hinder the working of Microsoft Outlook. Click on a fix and follow the commands on the screen of the window.