Failed to add geofence error

[hundredball]

I downloaded the FlutterGeofencing code and tried to utilize the geofencing plugin in my project.
I created a button for registering geofences. After creating the google map, I pressed the button and got the following error on the Android emulator.

I/flutter (28044): Permission status: PermissionStatus.granted
E/GeofencingPlugin(28044): Failed to add geofence: com.google.android.gms.common.api.ApiException: 1004:
E/flutter (28044): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: PlatformException(com.google.android.gms.common.api.ApiException: 1004: , null, null, null)
E/flutter (28044): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:597:7)
E/flutter (28044): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:177:18)
E/flutter (28044):
E/flutter (28044): #2 GeofencingManager.registerGeofence (package:geofencing/src/geofencing.dart:148:5)
E/flutter (28044):
E/flutter (28044): #3 _HomePageState._registerGeofences (package:google_maps_geojson/main.dart:398:9)
E/flutter (28044):
E/flutter (28044):

Since the error code means that the client doesn't have sufficient location permission to perform geofencing operations. I used the permission_handler plugin to assure that location permission is granted before initializing GeofencingManager. Permission is also granted before registering geofences.

Future initPlatformState() async {
_status = await Permission.location.request();
print('Location permission status: $_status');
print('Initializing...');
await GeofencingManager.initialize();
print('Initialization done');
}

However, I can successfully add the geofences without any issues when using the physical Android device. Is it possible that there's a conflict between google map and geofencing in the emulator but not in the physical devices?

Below is my flutter version. Any feedbacks are appreciated. Thank you for your time.

[hundredball]

I realized that I forgot to add background location permission in AndroidManifest.xml.

<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION"/>

After I added it and removed location_permission parts, now it works in both emulator and physical device!