Flutter The named parameter 'colors' isn't defined in SweepGradient

user_1830228 0
Viewed 14255

in my project i want to use SweepGradient and when i try to use with this definition i get error:

Context: Found this candidate, but the arguments don't match.
  const SweepGradient({
        ^^^^^^^^^^^^^

my code implementations:

static final BoxDecoration _gradientBorderDecoration = BoxDecoration(
  shape: BoxShape.circle,
  // https://brandpalettes.com/instagram-color-codes/
  gradient: SweepGradient(
    colors: [
      Color(0xFF833AB4), // Purple
      Color(0xFFF77737), // Orange
      Color(0xFFE1306C), // Red-pink
      Color(0xFFC13584), // Red-purple
    ],
  ),
);

SweepGradient construct class:

const SweepGradient({
  this.center = Alignment.center,
  this.startAngle = 0.0,
  this.endAngle = math.pi * 2,
  required List<Color> colors,
  List<double>? stops,
  this.tileMode = TileMode.clamp,
  GradientTransform? transform,
}) : assert(center != null),
     assert(startAngle != null),
     assert(endAngle != null),
     assert(tileMode != null),
     super(colors: colors, stops: stops, transform: transform);

flutter version:

Flutter 1.22.0-10.0.pre.153 • channel master • https://github.com/flutter/flutter.git
Framework • revision 2e643651a9 (15 hours ago) • 2020-09-11 23:07:03 -0400
Engine • revision 16b900b63e
Tools • Dart 2.10.0 (build 2.10.0-117.0.dev)
flutter
2 Answers

This happened to me as well after I upgraded to the latest stable flutter version 1.12. I fixed it doing following:

  1. Type in terminal: flutter clean
  2. Under File --> Invalidate Caches / Restart (click this option)

Afterwards everything worked like a charm again.

user_98746110

Solution for VS Code:

  1. run flutter clean from terminal.
  2. close VS Code completely and run again.
user_93161740
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