I was struggling with this error for 3 days and tried everything I could find online. I finally managed to fix it by moving the SDK import, which was originally inside an Objective-C condition, to a different location.

Before

` #ifdef FB_SONARKIT_ENABLED #import <FlipperKit/FlipperClient.h> #import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h> #import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h> #import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h> #import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h> #import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>

// Meta SDK #import <FBSDKCoreKit/FBSDKCoreKit-Swift.h> #import <AuthenticationServices/AuthenticationServices.h> #import <SafariServices/SafariServices.h>

static void InitializeFlipper(UIApplication *application) { FlipperClient *client = [FlipperClient sharedClient]; SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults]; [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]]; [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]]; [client addPlugin:[FlipperKitReactPlugin new]]; [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]]; [client start]; } #endif `

After

` // Meta SDK #import <FBSDKCoreKit/FBSDKCoreKit-Swift.h> #import <AuthenticationServices/AuthenticationServices.h> #import <SafariServices/SafariServices.h>

#ifdef FB_SONARKIT_ENABLED #import <FlipperKit/FlipperClient.h> #import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h> #import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h> #import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h> #import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h> #import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>

static void InitializeFlipper(UIApplication *application) { FlipperClient *client = [FlipperClient sharedClient]; SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults]; [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]]; [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]]; [client addPlugin:[FlipperKitReactPlugin new]]; [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]]; [client start]; } #endif `