title: The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift
body: <p>I am developing iOS application in objective c I want to use swift file in this application but when I run the application I get the fallowing error:</p>
  
  <p><strong>The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift. This setting can be set in the build settings editor.</strong></p>