swift - 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:

I have no idea where this is coming from, cleaning and deleting derived data didn't work.

Anyone else experiencing this problem?

Project settings:

Target settings:

Answer 1

I faced this issue when used the same constant names in a guard construction

let activityVC = ...
        
guard let activityVC = activityVC else { return }

But xcode didn't show me any warning for this row.