I need help pls what is wrong with this code

i was doing the challenge from Use Destructuring Assignment to Assign Variables from Arrays and i dont know the error

Your code so far

let a = 8, b = 6;
// Only change code below this line
const [a,b]=[b,a]

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Challenge: Use Destructuring Assignment to Assign Variables from Arrays

Link to the challenge:

You already declared the variables a and b so you can not declare them again. You should see an error message showing in the console with this fact.