ERROR

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/searchable_dropdown-1.1.3/lib/searchable_dropdown.dart:371:41: Error: The getter 'subhead' isn't defined for the class 'TextTheme'.
- 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/src/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'.
          ? Theme.of(context).textTheme.subhead
                                        ^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/searchable_dropdown-1.1.3/lib/searchable_dropdown.dart:374:16: Error: The getter 'subhead' isn't defined for the class 'TextTheme'.
- 'TextTheme' is from 'package:flutter/src/material/text_theme.dart' ('/C:/src/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'.
              .subhead

FAILURE: Build failed with an exception.

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

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\src\flutter\bin\flutter.bat'' finished with non-zero exit v  alue 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 42s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

SOLUTION

There are Two Solutions for this error

1. Use Alternative Package
2. Do some changes in .pub-cache

Use Alternative Package

I switched from searchable_dropdown to search_choices and it works OK. Since both packages show similar functionality, should we keep this issue open?

Source (githubmemory.com) :- https://githubmemory.com/repo/icemanbsi/searchable_dropdown/issues/15

Do some changes in .pub-cache

To fix this issue you have to make some changes in searchable_dropdown.dart

First, go to C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/searchable_dropdown-1.1.3/lib/searchable_dropdown.dart

Click CTRL + Mouse Left Go To The “.subhead” And Replace It With “.subtitle1” Or Just Copy Paste This

TextStyle get _textStyle =>
widget.style ??
(_enabled && !(widget.readOnly ?? false)
? Theme.of(context).textTheme.subtitle1
: Theme.of(context)
.textTheme
.subtitle1
.copyWith(color: _disabledIconColor));