[Flutter] Why am I getting errors while adding launcher icon in flutter project?

So, I am trying change the default flutter launcher icon with my one. I am using the flutter_launcher_icons: ^0.9.2 from pub.dev. The code in pubspec.yaml:

dependencies:
flutter:
sdk: flutter


# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.2
hexcolor: ^2.0.5
google_fonts: ^2.1.0
flutter_neumorphic: ^3.2.0
flutter_launcher_icons: ^0.9.2

dev_dependencies:
flutter_lints: ^1.0.4
flutter_test:
sdk: flutter

flutter_icons:
image_path: "assets/icon/icon.png"
android: true
ios: true


But when I am running flutter pub run flutter_launcher_icons:main, I am getting error saying:

════════════════════════════════════════════
FLUTTER LAUNCHER ICONS (v0.9.1)
════════════════════════════════════════════


✓ Successfully generated launcher icons
Unhandled exception:
FormatException: Invalid number (at character 1)

^

#0 int._handleFormatError (dart:core-patch/integers_patch.dart:129:7)
#1 int.parse (dart:core-patch/integers_patch.dart:55:14)
#2 minSdk (package:flutter_launcher_icons/android.dart:309:18)
#3 createIconsFromConfig (package:flutter_launcher_icons/main.dart:94:47)
#4 createIconsFromArguments (package:flutter_launcher_icons/main.dart:60:7)
#5 main (file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_launcher_icons-0.9.2/bin/main.dart:6:26)
#6 _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:32)
#7 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)
pub finished with exit code 255


And the Icon doesn't change.

What probably the problem?


=> I mean, coz it worked many times before...

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