FAILURE: Build failed with an exception.

[haneefi]

/.pub-cache/hosted/pub.dev/flex_color_scheme-8.0.0/lib/src/flex_sub_themes.dart:2559:7: Error: No named parameter with the name 'locale'.
locale: locale,
^^^^^^
/code/flutter/packages/flutter/lib/src/material/date_picker_theme.dart:40:9: Context: Found this candidate, but the arguments don't match.
const DatePickerThemeData({
^^^^^^^^^^^^^^^^^^^
Target kernel_snapshot failed: Exception

FAILURE: Build failed with an exception.

Getting this error.

[rydmike]

Hi @haneefi, thanks for reporting this issue. I think I know why you are seeing this and have a few options for you below.

What version of Flutter are you using? I'm guessing 3.22.x

I can see that you are using FlexColorScheme 8.0.0 from the cached version info in the path above, maybe consider upgrading to latest version, especially if you are using Flutter 3.29 or 3.32.

FlexColorScheme 8.0.0 requires min Flutter 3.24.0 to work, there was an API included in it by accident that prevents it from being used with Flutter 3.22 even though its constraints says it should be OK and it was intended to be OK. Version 8.0.0 is however not compatible with Flutter 3.22.0 as the locale property in DatePickerThemeData does not exist until Flutter 3.24.

Since you run into this issue my conclusion is that you must be using Flutter 3.22.x. If you can I would recommend updating to latest Flutter and latest FCS, but if you can't I also have a fix for that.

The package version 8.0.1 corrects this faulty version constraint by bumping it to 3.24, but is of course not compatible with Flutter 3.22, so if you must use Flutter 3.22.x it wont help you.

If you must use a version of FCS 8.0.0 that actually works with Flutter 3.22.x you can use this dev release version of FlexColorScheme https://pub.dev/packages/flex_color_scheme/versions/8.0.1-dev.3.22 that was released to help those with the exact issue you run into above, as a fix until they can upgrade to a newer Flutter release than 3.22.x.

This issue is documented in the change log here: https://pub.dev/packages/flex_color_scheme/changelog#801

Hope this helps.