FlutterBlueElvesPlugin.java:121: error: cannot find symbol public static void registerWith(PluginRegistry.Registrar registrar)

[AyeshaRizwan20]

I have recently migrated my android for my flutter project and starting getting the following issue with this package. Can you please address this and upgrade this package:

/Users/techtiz/.pub-cache/hosted/pub.dev/flutter_blue_elves-0.1.9/android/src/main/java/gao/xiaolei/flutter_blue_elves/FlutterBlueElvesPlugin.java:121: error: cannot find symbol
public static void registerWith(PluginRegistry.Registrar registrar) {
^
symbol: class Registrar
location: interface PluginRegistry
Note: /Users/techtiz/.pub-cache/hosted/pub.dev/flutter_blue_elves-0.1.9/android/src/main/java/gao/xiaolei/flutter_blue_elves/FlutterBlueElvesPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

FAILURE: Build failed with an exception.