XCode debug error Thread 1 Ok so I'm trying to work with swift on XCode but every time I start to run my code I get this 

Thread 1 Queue: com.apple.main-thread(serial)

What does this mean?, and how do I fix it? Also i've started a new project with the same code to make sure theres no unnecessary code mistakes. However I still get the same error.
What you describe as an error, it's not. That is the main queue where the program runs. You will see that queue every time you run a program.