Failed assertion: line 24 pos 15: 'color != null && color.alpha == 0xFF': is not true

flutter報錯Failed assertion: line 24 pos 15: 'color != null && color.alpha == 0xFF': is not true

 

原因是

theme: ThemeData(
    primaryColor: Color.fromRGBO(12, 23, 23, 0.8), // 用這個我會報錯，我改成Colors.blue就不報錯了

 　　primarySwatch: Colors.blue, 
),

 

 

參考文章：https://stackoverflow.com/questions/61813780/failed-assertion-line-24-pos-15-color-null-color-alpha-0xff-is-not