Expected Expression iOS Xcode

I'm trying to make a simple Calculator App and I'm following instructions in this video ( http://ift.tt/1l7FTYD )

However, when i got to about 9:14, I got an error saying "Expected Expression" and some mark before the else statement. I cannot post images now, so post me everything you know!

Thanks

(You can look at the video so you can see where I have my problem!)