title: FBSDKCoreKit/FBSDKCoreKit.h not found error
body: <p>I am implementing FB  Login so i Downloaded the SDK from <a href="https://developers.facebook.com/docs/ios" rel="noreferrer">https://developers.facebook.com/docs/ios</a>.
  then i drag n down <code>FBSDKCoreKit</code>, <code>FBSDKLoginKit</code> and <code>FBSDKShareKit</code> frameworks into my project.</p>
  
  <p>when i ran project it works fine. but when i closed and reopen it, then <code>"FBSDKCoreKit/FBSDKCoreKit.h  not found error"</code> appears. then again i copy paste <code>FBSDKCoreKit</code> framework into my project's library
   and error disappear and this process continues. anyone faced this problem before?</p>
  
  <p>what should i do to solve this error?</p>