Expecting }, found " .

Where is the problem ??? help plz

public var bullet : GameObject;

function Update() { 
    // Move the spaceship horizontally (no changes)

    // When the spacebar is pressed
    if (Input.GetKeyDown("j")) {
        // Create a new bullet at “transform.position” 
        // Which is the current position of the ship
        // Quaternion.identity = add the bullet with no rotation
        Instantiate(bullet, transform.position, Quaternion.identity);

Your if statement is missing a closing bracket.