title: STS project gives error cannot be read or is not a valid ZIP file
body: <p>I am for the first time trying java in Spring Tool Suite and using an example project imported, now running into endless issues. I tried building the project and go the following error:</p>
  
  <pre><code> Archive for required library: 'C:/Users/cccc/.m2/repository/com/vaadin/vaadin-client/7.1.0/
   vaadin-client-7.1.0.jar' in project 'quicktickets-dashboard' cannot be read or is not a 
   valid ZIP   file   quicktickets-dashboard      Build path  Build Path Problem
  </code></pre>
  
  <p>This is probably a spring issue and not related to the project itself. Please does anyone have a working solution to this. Tried a few, building, closing, rebuilding, deleting local repository etc. but still the same issue. Any ideas appreciated.</p>