integrating chartboost into swift having (error)

I have integrated all the chartboost the from http://ift.tt/1uXUDkS

but I'm keep getting this one error in my swift code.

Error Snapshot

I downloaded all the SDKs for Chartboost and made a bridge for the objective c and swift.

Also i have followed the same intructions as How to integrate Chartboost IOS SDK with Swift

I have done the same thing in my Swift code in integrating chartboost. in my header, and another problem, I'm not sure where i put the

Calling Syntax:
AppDelegate.showChartboostAds()