title: Could not open workspace file of Xcode
body: <p>When I am open my project in Xcode. it's not open.
  Display following alert.</p>
  
  <p>I also delete the <strong>project.xcworkspace</strong> file and create new scheme for this project. so that   it can be open.
  but when I am shut down or restart my pc and then once again open the project, it's not opening and display following alert with some error.</p>
  
  <p>so please tell me how to solve this error.
  <img src="https://i.stack.imgur.com/AnojJ.png" alt=""></p>