Command failed due to signal: Abort trap: 6

Question

Since Xcode 7 and Swift 2.0, I get the error above, like in the screenshot shown here:

Answer 1

In my case i had @objc protocol with optional methods and when i called its methods also in swift class i got that error, after removing the optional keyword from functions in the protocol the error was gone.

before (with error):

@objc protocol SomeDelegate:NSObjectProtocol{

    optional func someDelegateMethod()
}

class MySwiftClass{
    func notifyMyDelegate(){
        mydelegate?.someDelegateMethod?() //this line caused the error
    }
}

after:

@objc protocol SomeDelegate:NSObjectProtocol{

    func someDelegateMethod()
}

class MySwiftClass{
    func notifyMyDelegate(){
        mydelegate?.someDelegateMethod()
    }
}