Xcode error - Githubissues

The setup worked perfectly previously but now it giving me this error. Not sure why.

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_WKWebViewConfiguration", referenced from:
      objc-class-ref in OneSignal(OneSignal-x86_64-master.o)
  "_OBJC_CLASS_$_WKWebView", referenced from:
      objc-class-ref in OneSignal(OneSignal-x86_64-master.o)
  "_SCNetworkReachabilityGetFlags", referenced from:
      -[OneSignalReachability connectionRequired] in OneSignal(OneSignal-x86_64-master.o)
      -[OneSignalReachability currentReachabilityStatus] in OneSignal(OneSignal-x86_64-master.o)
  "_SCNetworkReachabilityCreateWithAddress", referenced from:
      +[OneSignalReachability reachabilityWithAddress:] in OneSignal(OneSignal-x86_64-master.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Output in Visual Studio

 └─Compiling, linking and signing...                         3.4s
Xcode build done.                                           44.8s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **

Xcode's output:
↳
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/agora_rtc_
    engine-3.2.1/ios/Classes/Base/Extensions.swift:117:22: warning: 'delay' is
    deprecated
                "delay": delay,
                         ^
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/agora_rtc_
    engine-3.2.1/ios/Classes/Base/RtcEngine.swift:693:31: warning:
    'setLocalVoiceChanger' is deprecated: use setAudioEffectPreset or
    setVoiceBeautifierPreset instead.
            callback.code(engine?.setLocalVoiceChanger(AgoraAudioVoiceChanger(rawVal
            ue: params["voiceChanger"] as! Int)!))
                                  ^
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/agora_rtc_
    engine-3.2.1/ios/Classes/Base/RtcEngine.swift:697:31: warning:
    'setLocalVoiceReverbPreset' is deprecated: use setAudioEffectPreset or
    setVoiceBeautifierPreset instead.
            callback.code(engine?.setLocalVoiceReverbPreset(AgoraAudioReverbPreset(r
            awValue: params["preset"] as! Int)!))
                                  ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:4: warning:
    'UNMutableNotificationContent' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
       ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationContent.h:63:12: note:
    'UNMutableNotificationContent' has been marked as being introduced in iOS 10.0
    here, but the deployment target is iOS 8.0.0
    @interface UNMutableNotificationContent : UNNotificationContent
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:1: note: annotate
    'didReceiveNotificationExtensionRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                             API_AVAILA
                                                                                                                                                                                             BLE(ios(10
                                                                                                                                                                                             .0))
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:74: warning:
    'UNNotificationRequest' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
                                                                             ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationRequest.h:16:12: note: 'UNNotificationRequest'
    has been marked as being introduced in iOS 10.0 here, but the deployment target
    is iOS 8.0.0
    @interface UNNotificationRequest : NSObject <NSCopying, NSSecureCoding>
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:1: note: annotate
    'didReceiveNotificationExtensionRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                             API_AVAILA
                                                                                                                                                                                             BLE(ios(10
                                                                                                                                                                                             .0))
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:137: warning:
    'UNMutableNotificationContent' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
                                                                                                                                            ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationContent.h:63:12: note:
    'UNMutableNotificationContent' has been marked as being introduced in iOS 10.0
    here, but the deployment target is iOS 8.0.0
    @interface UNMutableNotificationContent : UNNotificationContent
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:561:1: note: annotate
    'didReceiveNotificationExtensionRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)didReceiveNotificationExtensionRequest:(UNNotific
    ationRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                             API_AVAILA
                                                                                                                                                                                             BLE(ios(10
                                                                                                                                                                                             .0))
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:4: warning:
    'UNMutableNotificationContent' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
       ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationContent.h:63:12: note:
    'UNMutableNotificationContent' has been marked as being introduced in iOS 10.0
    here, but the deployment target is iOS 8.0.0
    @interface UNMutableNotificationContent : UNNotificationContent
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:1: note: annotate
    'serviceExtensionTimeWillExpireRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                            API_AVAILA
                                                                                                                                                                                            BLE(ios(10
                                                                                                                                                                                            .0))
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:73: warning:
    'UNNotificationRequest' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
                                                                            ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationRequest.h:16:12: note: 'UNNotificationRequest'
    has been marked as being introduced in iOS 10.0 here, but the deployment target
    is iOS 8.0.0
    @interface UNNotificationRequest : NSObject <NSCopying, NSSecureCoding>
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:1: note: annotate
    'serviceExtensionTimeWillExpireRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                            API_AVAILA
                                                                                                                                                                                            BLE(ios(10
                                                                                                                                                                                            .0))
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:136: warning:
    'UNMutableNotificationContent' is only available on iOS 10.0 or newer
    [-Wunguarded-availability]
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
                                                                                                                                           ^
    In module 'UserNotifications' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:45:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UserNotifications
    .framework/Headers/UNNotificationContent.h:63:12: note:
    'UNMutableNotificationContent' has been marked as being introduced in iOS 10.0
    here, but the deployment target is iOS 8.0.0
    @interface UNMutableNotificationContent : UNNotificationContent
               ^
    While building module 'OneSignal' imported from
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/onesignal_
    flutter-2.6.2/ios/Classes/OneSignalPlugin.h:29:
    In file included from <module-includes>:1:
    /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/OneSignal/iOS_SDK/OneSignalSDK/F
    ramework/OneSignal.framework/Headers/OneSignal.h:562:1: note: annotate
    'serviceExtensionTimeWillExpireRequest:withMutableNotificationContent:' with an
    availability attribute to silence this warning
    +
    (UNMutableNotificationContent*)serviceExtensionTimeWillExpireRequest:(UNNotifica
    tionRequest*)request
    withMutableNotificationContent:(UNMutableNotificationContent*)replacementContent
    ;
    ^
                                                                                                                                                                                            API_AVAILA
                                                                                                                                                                                            BLE(ios(10
                                                                                                                                                                                            .0))
    6 warnings generated.
    6 warnings generated.
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/permission
    _handler-5.0.0/ios/Classes/strategies/NotificationPermissionStrategy.m:71:5:
    warning: 'UIRemoteNotificationType' is deprecated: first deprecated in iOS 8.0 -
    Use UserNotifications Framework's UNAuthorizationOptions for user notifications
    and registerForRemoteNotifications for receiving remote notifications instead.
    [-Wdeprecated-declarations]
        UIRemoteNotificationType type = [[UIApplication sharedApplication]
        enabledRemoteNotificationTypes];
        ^
    In module 'UIKit' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/Target Support
    Files/permission_handler/permission_handler-prefix.pch:2:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UIKit.framework/H
    eaders/UIApplication.h:69:32: note: 'UIRemoteNotificationType' has been
    explicitly marked deprecated here
    typedef NS_OPTIONS(NSUInteger, UIRemoteNotificationType) {
                                   ^
    /Users/johnsmith/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/permission
    _handler-5.0.0/ios/Classes/strategies/NotificationPermissionStrategy.m:71:72:
    warning: 'enabledRemoteNotificationTypes' is deprecated: first deprecated in iOS
    8.0 - Use -[UIApplication isRegisteredForRemoteNotifications] and
    UserNotifications Framework's -[UNUserNotificationCenter
    getNotificationSettingsWithCompletionHandler:] to retrieve user-enabled remote
    notification and user notification settings [-Wdeprecated-declarations]
        UIRemoteNotificationType type = [[UIApplication sharedApplication]
        enabledRemoteNotificationTypes];
                                                                           ^
    In module 'UIKit' imported from /Users/Raymond
    Tucker/AndroidStudioProjects/yurr/user/ios/Pods/Target Support
    Files/permission_handler/permission_handler-prefix.pch:2:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/De
    veloper/SDKs/iPhoneSimulator13.2.sdk/System/Library/Frameworks/UIKit.framework/H
    eaders/UIApplication.h:229:1: note: 'enabledRemoteNotificationTypes' has been
    explicitly marked deprecated here
    - (UIRemoteNotificationType)enabledRemoteNotificationTypes API_DEPRECATED("Use
    -[UIApplication isRegisteredForRemoteNotifications] and UserNotifications
    Framework's -[UNUserNotificationCenter
    getNotificationSettingsWithCompletionHandler:] to retrieve user-enabled remote
    notification and user notification settings", ios(3.0, 8.0))
    API_UNAVAILABLE(tvos);
    ^
    2 warnings generated.
    === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
    Undefined symbols for architecture x86_64:
      "_OBJC_CLASS_$_WKWebViewConfiguration", referenced from:
          objc-class-ref in OneSignal(OneSignal-x86_64-master.o)
      "_OBJC_CLASS_$_WKWebView", referenced from:
          objc-class-ref in OneSignal(OneSignal-x86_64-master.o)
      "_SCNetworkReachabilityGetFlags", referenced from:
          -[OneSignalReachability connectionRequired] in
          OneSignal(OneSignal-x86_64-master.o)
          -[OneSignalReachability currentReachabilityStatus] in
          OneSignal(OneSignal-x86_64-master.o)
      "_SCNetworkReachabilityCreateWithAddress", referenced from:
          +[OneSignalReachability reachabilityWithAddress:] in
          OneSignal(OneSignal-x86_64-master.o)
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

Could not build the application for the simulator.
Error launching application on iPhone 11 Pro Max.

OneSignal / OneSignal-Flutter-SDK

Xcode error #378