I am new to Flutter, I started Flutter last week, And now I want to make a simple Xylophone app. I created the UI successfully and made a function `playSound(int soundNumber)` but when I call this function for playing sound, it gives me this error.

    **The following _TypeError was thrown building Body(dirty, state: _BodyState#051c2):
    type &#39;_MaterialStatePropertyAll&lt;dynamic&gt;&#39; is not a subtype of type &#39;MaterialStateProperty&lt;Color?&gt;?&#39;**

Here&#39;s the code I wrote for `playSound(int soundNumber)` function.

    void playSound(int soundNumber) {
    final player = AudioCache();
    player.play(&#39;note$soundNumber.wav&#39;);}

    Expanded buildPlayButton({MaterialStateProperty color, int soundNumber}){
    return Expanded(
      child: ElevatedButton(
        onPressed: () {
          playSound(soundNumber);
        },
        style: ButtonStyle(
          backgroundColor: color,
        ),
      ),
    );}

Here is the point where I am calling this function.

    Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: &lt;Widget&gt;[
        buildPlayButton(color: MaterialStateProperty.all(Colors.red), soundNumber: 1),
        buildPlayButton(color: MaterialStateProperty.all(Colors.orangeAccent), soundNumber: 2),
        buildPlayButton(color: MaterialStateProperty.all(Colors.yellow), soundNumber: 3),
        buildPlayButton(color: MaterialStateProperty.all(Colors.indigo), soundNumber: 4),
        buildPlayButton(color: MaterialStateProperty.all(Colors.blue), soundNumber: 5),
        buildPlayButton(color: MaterialStateProperty.all(Colors.lightGreenAccent), soundNumber: 6),
        buildPlayButton(color: MaterialStateProperty.all(Colors.green), soundNumber: 7),
      ],
    );
    }

How to call this function because it gives me the above-mentioned error?

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