Failed prop type: The prop `todos` is marked as required in `index`, but its value is `undefined`.

This error occurs when a required prop is not passed to a component or when it is passed as undefined.

To fix this error, you can check if the `todos` prop is being passed correctly to the component. Make sure that the prop is not undefined and that it has the expected data type.

If you are passing the prop correctly but it is still showing as undefined, you can add a default value to the prop by using the defaultProps property.

For example:

import React from 'react';

function MyComponent({ todos }) {
  // component code
}

MyComponent.defaultProps = {
  todos: []
};

export default MyComponent;

In this example, we set a default value of an empty array for the `todos` prop. This way, if the prop is not passed or is passed as undefined, the component will still render without any errors.