title: Failed getting class factory de COM of component with CLSID {A9E69610-B80D-11D0-B9B9-00A0C922E750} error: 80040154 Class not Registered
body: <p>I am a student, and today on my class when I tryed to run a project with WCF Test client, the visual Sutdio 2019 retrieves me this error:</p>
  <pre><code>Error: Cannot obtain Metadata from http://localhost:54417/ServiceBookStore.svc 
  If this is a Windows (R) Communication Foundation service to which you have access, please check that you have enabled metadata publishing at the specified address.  
  For help enabling metadata publishing, please refer to the MSDN documentation at http://go.microsoft.com/fwlink/?LinkId=65455.WS-Metadata Exchange Error    URI: http://localhost:54417/ServiceBookStore.svc  
  </code></pre>
  <p>My teacher and I tryed to solve the problem, I had search for a solution but I didn't found too much things. I tryed to uninstall VS 2019 but didnt work so well</p>
  <p>Print with error:</p>
  <p><a href="https://i.stack.imgur.com/IC3gj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IC3gj.png" alt="enter image description here" /></a></p>
  <p>Thanks for any help!</p>