How to fix 'cannot assign to value: 'x' is a 'let' constant' error in swift?

This error arises when you attempt to assign a value to a constant defined using `let`. Example:

let myConst = 10
myConst = 20

Solution:

var myVar = 10
myVar = 20

In Swift, use `var` for variables and `let` for constants. Ensure you're not trying to modify constants.