[优化]

ios/Classes/SwiftOpenVPNFlutterPlugin.swift

@@ -250,10 +250,7 @@ class VPNUtils {
                             }
                         })
                     } else {
-                        guard let err = error else { return }
-                        if err.localizedDescription == "permission denied" {
-                            completion(error);
-                        }
+                        completion(error);
                     }
                 })
             }

lib/src/vpn_engine.dart

@@ -121,26 +121,25 @@ class OpenVPN {
   ///username & password : set your username and password if your config file has auth-user-pass
   ///
   ///bypassPackages : exclude some apps to access/use the VPN Connection, it was List<String> of applications package's name (Android Only)
-  Future<dynamic> connect(String config, String name,
+  Future connect(String config, String name,
       {String? username,
       String? password,
       List<String>? bypassPackages,
-      bool certIsRequired = false}) async {
+      bool certIsRequired = false}) {
     if (!initialized) throw ("OpenVPN need to be initialized");
     if (!certIsRequired) config += "client-cert-not-required";
     _tempDateTime = DateTime.now();
 
     try {
-      return await _channelControl.invokeMethod("connect", {
+      return _channelControl.invokeMethod("connect", {
         "config": config,
         "name": name,
         "username": username,
         "password": password,
         "bypass_packages": bypassPackages ?? []
       });
     } on PlatformException catch (e) {
-      return e.message;
-      // throw FlutterError('${e.message}}');
+      throw ArgumentError(e.message);
     }
   }