Invalid constant value in const constructor

Why This Happens

In Dart, const constructors require all arguments to be compile-time constants. If you pass a variable or function result to a const constructor, this error occurs. Remove the const keyword or ensure all values are compile-time constants.

The Problem

final color = Colors.blue;
const widget = Icon(Icons.star, color: color); // color is not const!

The Fix

const color = Colors.blue;
const widget = Icon(Icons.star, color: color); // Now color is const

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error: Invalid constant value. A non-const value is used where a compile-time constant is required.

2. 2

   Find the cause

   Check the const constructor call for any arguments that are not compile-time constants (variables, function calls).

3. 3

   Apply the fix

   Either make the value const, or remove the const keyword from the constructor call.