Beginner lesson 7 error?

Hello! First time here! Hi my name is Marcos and I’m coding because I believe to become successful you need to either have real estate or create something. I wanted to create an app and here is where I decided to learn and I’m enjoying it very much so far…

Anywho I finished lesson 7 and im trying the exercise however I can only get the console to say the following
“Fuel added
Current Fuel Level at 100”

my code looks as follows…

,
class Spaceship {

var fuelLevel = 50


func liftOff() {
    
   
    fuelLevel -= 50
    
    print("We have lift off!")
    print("Current Fuel Level at: \(fuelLevel)")
}

func addFuel(fuel:Int) {
    
    fuelLevel += fuel
    
    print("Fuel Added")
    print("Current Fuel Level at: \(fuelLevel)")
    
}

func Thrust() {
    
    fuelLevel -= 15
    
    print("Rocket is Thrusting")
    print("Current Fuel Level at: \(fuelLevel)")
}

func Cruise() {
    
    fuelLevel -= 5
    
    print("Rocket is Cruising")
    
    print("Current Fuel Level at: \(fuelLevel)")
    

}

}

let spaceshipObject = Spaceship()
spaceshipObject.addFuel(fuel: 50)
spaceshipObject.liftOff
spaceshipObject.Thrust

spaceshipObject.Cruise

,

the other calls also need to have () even when blank
so
spaceshipObject.liftOff()
spaceshipObject.Thrust()
spaceshipObject.Cruise()

Thank you so much!! I appreciate this so much!