No connect vpn Manager

[muzaffer72]

Hello ı have problem.

2022-07-09 15:07:14.840 6847-6885/com.losgif.sail_app E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: MissingPluginException(No implementation found for method enableVPNManager on channel com.losgif.sail/vpn_manager) #0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:165:7) #1 VpnManager.enableVPNManager (package:sail_app/channels/vpn_manager.dart:10:16) #2 AppModel.togglePowerButton (package:sail_app/models/app_model.dart:12:7)

My build Gradle. Default Setting for project

buildscript { ext.kotlin_version = '1.6.10' repositories { google() jcenter() }

dependencies {
    classpath 'com.android.tools.build:gradle:4.1.1'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}

}