Type 'FirebasePluginPlatform' not found error

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Facing issues while running the application on both Android and iOS.

../../../../../.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.18.0+1/lib/src/firebase_auth.dart:8:28: Error: Type 'FirebasePluginPlatform' not found.
class FirebaseAuth extends FirebasePluginPlatform {
^^^^^^^^^^^^^^^^^^^^^^
../../../../../.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.18.0+1/lib/src/firebase_auth.dart:24:38: Error: The getter 'pluginConstants' isn't defined for the class 'FirebaseAuth'.

'FirebaseAuth' is from 'package:firebase_auth/firebase_auth.dart' ('../../../../../.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.18.0+1/lib/firebase_auth.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'pluginConstants'.
app: app, pluginConstants: pluginConstants);
^^^^^^^^^^^^^^^
../../../../../.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.18.0+1/lib/src/firebase_auth.dart:33:14: Error: Too many positional arguments: 0 allowed, but 2 found.
Try removing the extra positional arguments.
: super(app.name, 'plugins.flutter.io/firebase_auth');