title: The “Swift Language Version” (SWIFT_VERSION) build setting error with project in Objective C
body: <p>So i just went to build my app after adding in core data to update my app to store and fetch some information and i got this error. (I am using XCode 9.2)</p>
  
  <blockquote>
    <p>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.</p>
  </blockquote>
  
  <p>Now whats confusing me is this in an Objective C app and surely the swift version shouldn't matter. I have browsed some threads on here stating that i need to update build setting to Swift 3.0 or to set values to Yes then back to No, however i have none of these fields when i search for Swift in the search bar.</p>
  
  <p><a href="https://i.stack.imgur.com/eWJ01.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eWJ01.png" alt="buildSettings"></a></p>
  
  <p>Is this just a bizarre bug or have i mistakenly added some swift code?</p>
  
  <p>Any ideas would help, thanks.</p>