title: facebook_ads_api show"nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace"
body: <p>i m using Facebook Audience Network SDK,
  this is my code:</p>
  
  <pre><code>-(void)loadInterstitialAd
  {
      FBInterstitialAd *interstitialAd =
      [[FBInterstitialAd alloc] initWithPlacementID:@"1783280735273073_1783280748606405"];
      interstitialAd.delegate = self;
      [interstitialAd loadAd];
  }
  </code></pre>
  
  <p>but there is a problem:</p>
  
  <pre><code>2016-10-10 15:44:47.296707 facebookADTest[35670:2286565] [] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
      [x86_64] libnetcore-856.1.8
  0   libsystem_network.dylib             0x00000001064af80e __nw_create_backtrace_string + 123
  1   libnetwork.dylib                    0x000000010693f194 nw_socket_add_input_handler + 3002
  2   libnetwork.dylib                    0x000000010691cdb8 nw_endpoint_flow_attach_protocols + 3768
  3   libnetwork.dylib                    0x000000010691bdd5 nw_endpoint_flow_setup_socket + 563
  4   libnetwork.dylib                    0x000000010691ab34 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
  5   libnetwork.dylib                    0x0000000106935d11 nw_endpoint_handler_path_change + 1261
  6   libnetwork.dylib                    0x0000000106935740 nw_endpoint_handler_start + 570
  7   libnetwork.dylib                    0x000000010694d003 nw_endpoint_resolver_start_next_child + 2240
  8   libdispatch.dylib                   0x000000
  </code></pre>
  
  <p>i dont know what case this problem,and i cannot find any info about it,is there any idea?</p>