FFDevEnvironmentValues not defined

I am trying to display the current environment in a Text widget, and get this error:
60 packages have newer versions incompatible with dependency constraints.Try flutter pub outdated for more information. Launching lib/main.dart on Web Server in debug mode...
Waiting for connection from debug service on Web Server...      lib/screens/chat/chat_widget.dart:9:8: Error: Error when reading 'lib/environment_values.dart': No such file or directory
import '/environment_values.dart';
       ^
lib/screens/chat/chat_model.dart:9:8: Error: Error when reading 'lib/environment_values.dart': No such file or directory
import '/environment_values.dart';
       ^
lib/screens/chat/chat_widget.dart:761:25: Error: The getter 'FFDevEnvironmentValues' isn't defined for the class '_ChatWidgetState'.
 - '_ChatWidgetState' is from 'package:one_mind/screens/chat/chat_widget.dart' ('lib/screens/chat/chat_widget.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'FFDevEnvironmentValues'.
                        FFDevEnvironmentValues.currentEnvironment,
                        ^^^^^^^^^^^^^^^^^^^^^^
Waiting for connection from debug service on Web Server...         51.2s
Failed to compile application.