title: react native ios - Undefined symbols for architecture x86_64
body: <p>I have built a react native app that runs fine in android.....but when I try to build in ios I get the following error: <code>Undefined symbols for architecture x86_64</code>
  It appears to be linked in some way to flipper, as the detailed errors are as below:<br></p>
  <pre><code>     link with file built for iOS Simulator-arm64
  Undefined symbols for architecture x86_64:
    &quot;_OBJC_CLASS_$_FlipperKitNetworkPlugin&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FlipperKitReactPlugin&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_SKDescriptorMapper&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FlipperClient&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_RNCPushNotificationIOS&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FlipperKitLayoutPlugin&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_RCTRootView&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_RCTBridge&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_SKIOSNetworkAdapter&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_RCTBundleURLProvider&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FBSDKApplicationDelegate&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FIRApp&quot;, referenced from:
        objc-class-ref in AppDelegate.o
    &quot;_OBJC_CLASS_$_FKUserDefaultsPlugin&quot;, referenced from:
        objc-class-ref in AppDelegate.o
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>