flutter_form_builder: The getter 'XXX' isn't defined for the class 'TextTheme'

[pablogalve]

Describe the bug
Using this library doesn't let you compile. It detects getters that are not defined for the class 'TextTheme'.

Console Log

/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:96:25: Error: The getter 'display1' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'display1'.
        headerTextTheme.display1.copyWith(color: dayColor, height: 1.4);
                        ^^^^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:98:25: Error: The getter 'subhead' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'subhead'.
        headerTextTheme.subhead.copyWith(color: yearColor, height: 1.4);
                        ^^^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:455:51: Error: The getter 'body1' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body1'.
        TextStyle itemStyle = themeData.textTheme.body1;
                                                  ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:470:49: Error: The getter 'body2' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body2'.
          itemStyle = themeData.accentTextTheme.body2;
                                                ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:475:49: Error: The getter 'body2' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body2'.
          itemStyle = themeData.accentTextTheme.body2;
                                                ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:483:49: Error: The getter 'body2' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body2'.
          itemStyle = themeData.accentTextTheme.body2;
                                                ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:495:43: Error: The getter 'body1' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body1'.
          itemStyle = themeData.textTheme.body1
                                          ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:502:35: Error: The getter 'body2' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body2'.
              themeData.textTheme.body2.copyWith(color: themeData.accentColor);
                                  ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:564:46: Error: The getter 'subhead' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'subhead'.
                  style: themeData.textTheme.subhead,
                                             ^^^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:946:49: Error: The getter 'body1' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'body1'.
    final TextStyle style = themeData.textTheme.body1;
                                                ^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/date_range_picker-1.0.7/lib/date_range_picker.dart:957:35: Error: The getter 'headline' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'headline'.
            ? themeData.textTheme.headline
                                  ^^^^^^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/country_pickers-1.3.0/lib/utils/my_alert_dialog.dart:139:36: Error: Method not found: 'ButtonTheme.bar'.
      children.add(new ButtonTheme.bar(
                                   ^^^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/country_pickers-1.3.0/lib/utils/my_alert_dialog.dart:108:46: Error: The getter 'title' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'title'.
          style: Theme.of(context).textTheme.title,
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/country_pickers-1.3.0/lib/utils/my_alert_dialog.dart:130:48: Error: The getter 'subhead' isn't defined for the class 'TextTheme'.
 - 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/flutter/packages/flutter/lib/src/material/text_theme.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'subhead'.
            style: Theme.of(context).textTheme.subhead,
                                               ^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1005

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 35s
Running Gradle task 'assembleDebug'...                             36,6s
Exception: Gradle task assembleDebug failed with exit code 1

Flutter doctor -v

[√] Flutter (Channel stable, 2.5.2, on Microsoft Windows [Versión 10.0.19043.1237], locale es-ES)
    • Flutter version 2.5.2 at C:\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 3595343e20 (4 days ago), 2021-09-30 12:58:18 -0700
    • Engine revision 6ac856380f
    • Dart version 2.14.3

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at C:\Users\Pablo Galve\AppData\Local\Android\sdk
    • Platform android-30, build-tools 30.0.2
    • Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 2020.3)
    • Android Studio at D:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[√] VS Code (version 1.60.2)
    • VS Code at C:\Users\Pablo Galve\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.27.0

[√] Connected device (3 available)
    • sdk gphone x86 (mobile) • emulator-5554 • android-x86    • Android 11 (API 30) (emulator)
    • Chrome (web)            • chrome        • web-javascript • Google Chrome 94.0.4606.71
    • Edge (web)              • edge          • web-javascript • Microsoft Edge 94.0.992.38

• No issues found!