title: React-native Xcode error : "Thread 1: signal SIGABRT"
body: <p>I faced this problem after building an app in XCode.
  Here are some logs:</p>
  
  <pre><code>2019-12-23 11:43:38.538929+0200 signer[87746:1862730] You've implemented -[&lt;UIApplicationDelegate&gt; application:performFetchWithCompletionHandler:], but you still need to add "fetch" to the list of your supported UIBackgroundModes in your Info.plist.
  2019-12-23 11:43:38.541152+0200 signer[87746:1862730] You've implemented -[&lt;UIApplicationDelegate&gt; application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
  2019-12-23 11:43:38.546 [info][tid:main][RCTCxxBridge.mm:213] Initializing &lt;RCTCxxBridge: 0x7fa7de405980&gt; (parent: &lt;RCTBridge: 0x600002424cb0&gt;, executor: (null))
  2019-12-23 11:43:38.550376+0200 signer[87746:1862730] Initializing &lt;RCTCxxBridge: 0x7fa7de405980&gt; (parent: &lt;RCTBridge: 0x600002424cb0&gt;, executor: (null))
  2019-12-23 11:43:38.639 [info][tid:main][RCTRootView.m:293] Running application signer ({
      initialProps =     {
      };
      rootTag = 1;
  })
  2019-12-23 11:43:38.639089+0200 signer[87746:1862730] Running application signer ({
      initialProps =     {
      };
      rootTag = 1;
  })
  2019-12-23 11:43:38.990604+0200 signer[87746:1862730] -[RCTReconnectingWebSocket initWithURL:queue:]: unrecognized selector sent to instance 0x600000149650
  2019-12-23 11:43:39.046365+0200 signer[87746:1862730] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[RCTReconnectingWebSocket initWithURL:queue:]: unrecognized selector sent to instance 0x600000149650'
  *** First throw call stack:
  (
    0   CoreFoundation                      0x00007fff23c7127e exceptionPreprocess + 350
    1   libobjc.A.dylib                     0x00007fff513fbb20 objc_exception_throw + 48
    2   CoreFoundation                      0x00007fff23c91fd4 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
    3   CoreFoundation                      0x00007fff23c75c4c ___forwarding___ + 1436
    4   CoreFoundation                      0x00007fff23c77f78 _CF_forwarding_prep_0 + 120
    5   signer                              0x00000001083876a5 _ZL17socketForLocationP8NSString + 821
    6   signer                              0x000000010838708c -[RCTPackagerConnection init] + 284
    7   signer                              0x0000000108386f44 __49+[RCTPackagerConnection sharedPackagerConnection]_block_invoke + 36
    8   libdispatch.dylib                   0x0000000109240d48 _dispatch_client_callout + 8
    9   libdispatch.dylib                   0x0000000109242297 _dispatch_once_callout + 66
    10  signer                              0x0000000108386ef4 +[RCTPackagerConnection sharedPackagerConnection] + 84
    11  signer                              0x000000010830e757 -[RCTDevSettings setBridge:] + 567
    12  Foundation                          0x00007fff25712ee3 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 325
    13  signer                              0x0000000108373f2d -[RCTModuleData setBridgeForInstance] + 509
    14  signer                              0x0000000108373ab3 -[RCTModuleData setUpInstanceAndBridge] + 2131
    15  signer                              0x0000000108375427 __25-[RCTModuleData instance]_block_invoke + 39
    16  signer                              0x0000000108396083 RCTUnsafeExecuteOnMainQueueSync + 67
    17  signer                              0x0000000108375122 -[RCTModuleData instance] + 738
    18  signer                              0x00000001082b32d4 __49-[RCTCxxBridge _prepareModulesWithDispatchGroup:]_block_invoke + 196
    19  libdispatch.dylib                   0x000000010923fdd4 _dispatch_call_block_and_release + 12
    20  libdispatch.dylib                   0x0000000109240d48 _dispatch_client_callout + 8
    21  libdispatch.dylib                   0x000000010924eadb _dispatch_main_queue_callback_4CF + 721
    22  CoreFoundation                      0x00007fff23bd4049 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 9
    23  CoreFoundation                      0x00007fff23bceca9 __CFRunLoopRun + 2329
    24  CoreFoundation                      0x00007fff23bce066 CFRunLoopRunSpecific + 438
  25  GraphicsServices                    0x00007fff384c0bb0 GSEventRunModal + 65
    26  UIKitCore                           0x00007fff48092d4d UIApplicationMain + 1621
    27  signer                              0x00000001081dc8d0 main + 112
    28  libdyld.dylib                       0x00007fff5227ec25 start + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  (lldb)
  </code></pre>
  
  <p>Same project builds fine on android, but ios throws this error.
  I have not found anything on the web to solve this type of problem.
  Any help appreciated!</p>