The compiler of JS is not working.

The output panel is continuously showing "try again". It's not executing the code even though my code is correct.

let a = "Hello";

function greeting() {
/ Add the local variable here/
let b = "Studytonight";

console.log(`${a} ${b}`);
}
greeting();
console.log(a + b);
Please it's my request to fix this issue asap.