libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

Answer 1

Swift 4:

I was getting this error because of a change in the UIVisualEffectView api. In Swift 3 it was ok to do this: myVisuallEffectView.addSubview(someSubview)

But in Swift 4 I had to change it to this: myVisualEffectView.contentView.addSubview(someSubview)