title: FB SDK integration error in device only + IOS SDK
body: <p>i have added app detail on facebook app setting like add bundle id and enable facebook login.</p>
  
  <p>but still i am getting below error:</p>
  
  <p><code>error Domain=com.facebook.sdk Code=2 "The operation couldn’t be completed. (com.facebook.sdk error 2.)" UserInfo=0x1d100770</code> </p>
  
  <pre><code>{
      com.facebook.sdk: ErrorLoginFailedReason=com.facebook.sdk: SystemLoginError,
      com.facebook.sdk: ErrorInnerErrorKey=ErrorDomain=NSURLErrorDomainCode=-1202"The certificate for this server is invalid. You might be connecting to a server that is pretending to be “api.facebook.com” which could put your confidential information at risk."UserInfo=0x1d101ea0{
          NSErrorFailingURLStringKey=https: //api.facebook.com/method/auth.iosauthorizeapp,
          NSLocalizedRecoverySuggestion=Wouldyouliketoconnecttotheserveranyway?,
          NSErrorFailingURLKey=https: //api.facebook.com/method/auth.iosauthorizeapp,
          NSLocalizedDescription=Thecertificateforthisserverisinvalid.Youmightbeconnectingtoaserverthatispretendingtobe“api.facebook.com”whichcouldputyourconfidentialinformationatrisk.
      },
      com.facebook.sdk: ErrorSessionKey=&lt;FBSession: 0x1c5a43a0,
      state: FBSessionStateClosedLoginFailed,
      loginHandler: 0x0,
      appID: 504044126326670,
      urlSchemeSuffix: ,
      tokenCachingStrategy: &lt;FBSessionTokenCachingStrategy: 0x1c5d1a70&gt;,
      expirationDate: (null),
      refreshDate: (null),
      attemptedRefreshDate: 0001-12-3000: 00: 00+0000,
      permissions: (null)&gt; }
  </code></pre>
  
  <p>thanks</p>