Not compiling

+++++Main app pub get+++++
Running "flutter pub get" in app... 1,253ms
The plugin `cloud_firestore` uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future
release of Flutter will remove these deprecated APIs.
If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.
+++++Main app run+++++
The plugin `cloud_firestore` uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future
release of Flutter will remove these deprecated APIs.
If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.
Using hardware rendering with device sdk gphone x86 arm. If you notice graphics artifacts, consider enabling software rendering with "--enable-software-rendering".
Launching lib/main.dart on sdk gphone x86 arm in debug mode...
Plugin project :firebase_core_web not found. Please update settings.gradle.
Plugin project :firebase_auth_web not found. Please update settings.gradle.
../../flutter-sdk/flutter/.pub-cache/hosted/pub.dartlang.org/uuid_enhanced-3.0.2/lib/uuid.dart:9:7: Error: 'UnmodifiableUint8ListView' is restricted and can't be extended or implemented.

../shared/lib/modules/authentication/models/firebase_user.dart:8:10: Error: The parameter 'uid' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
this.uid,
^^^
../shared/lib/modules/authentication/models/firebase_user.dart:9:10: Error: The parameter 'email' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
this.email,
^^^^^
../shared/lib/modules/authentication/models/firebase_user.dart:10:10: Error: The parameter 'token' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
this.token,
^^^^^
../shared/lib/modules/authentication/bloc/authentication/authentication_event.dart:21:30: Error: The parameter 'email' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
UserSignUp({@required this.email, this.password});
^^^^^
../shared/lib/modules/authentication/bloc/authentication/authentication_event.dart:21:42: Error: The parameter 'password' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
UserSignUp({@required this.email, this.password});
^^^^^^^^
../shared/lib/modules/authentication/bloc/authentication/authentication_event.dart:30:29: Error: The parameter 'email' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'.
Try adding either an explicit non-'null' default value or the 'required' modifier.
UserLogin({@required this.email, this.password});

Start by reproducing the build from lib/main.dart and review the reported errors in shared/lib/modules/authentication/models/firebase_user.dart, shared/lib/modules/authentication/bloc/authentication/authentication_event.dart, and settings.gradle. Check the Flutter and Firebase plugin setup, including the uuid_enhanced dependency. Done means the app builds and launches without the listed plugin, dependency, and nullability errors.

Written by the indexing model from the issue text.