title: User or role does not exist in the database
body: <p>I am trying to locally install a CMS for my website. During this installation process, it shows me an error "User or role does not exist in the database.
  Screenshot of the error: </p>
  
  <p><img src="https://i.stack.imgur.com/Intaa.jpg" alt="alt text"></p>
  
  <p>Here's the screenshot of the database properties from Management Studio.
  <img src="https://i.stack.imgur.com/rHn0B.jpg" alt="alt text"></p>
  
  <p>How can I add a new role or user to this database?</p>