NativeBase: Error using cards

I’m trying to use cards inside of my component, and run across this issue whenever the <CardItem /> is used inside of a card. I have my imports setup correctly. I can render <Card> components fine, the error only occurs when adding in <CardItem>

ExceptionsManager.js:61 Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. Check the render method of YakView.