Help with "The story heats up!"


var age = prompt("What's you age?");

if(age <= 13){
console.log ("You can play");


confirm("I Understand");

console.log("You are at a Justin Bieber concert, and you hear this lyric 'Lace my shoes off, start racing.'");

console.log("Suddenly, Bieber stops and says, 'Who wants to race me?'");

var userAnswer = prompt("Do you want to race Bieber on stage?");

if (userAnswer = "yes") {
console.log("You and Bieber start racing. It's neck and neck! You win by a schoelace!");

else {
console.log("Oh no! Bieber shakes his head and sings 'I set a pace, so I can race without pacing.'");

The code works but i get a error message "
Oops, try again. Did you remember to put in the 'yes' answer option?"

Some one got the soultion or same problem?