Unhandled Exception: MissingPluginException(No implementation found for method openApp on channel launch_vpn) #31
Description
i got this error, when try to use method openApp().
/flutter (14668): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method openApp on channel launch_vpn)
E/flutter (14668): #0 MethodChannel._invokeMethod
platform_channel.dart:308
E/flutter (14668):
E/flutter (14668): #1 LaunchApp.openApp
external_app_launcher.dart:46
E/flutter (14668):
E/flutter (14668): #2 _HomePageState.mainMenu2.
homepage.dart:251
E/flutter (14668):
E/flutter (14668):
what should i do?