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AWT CardLayout Confusion

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I made a class as shown to play around with CardLayout

This compiles fine but results in a runtime error:

My problem is, i don't know which add(String, Component) method compiler is referring to. It's not part of the container (I tried Frame vs Panel) nor is it part of the layoutmanager...
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when u add components to a container with a cardLayout u need to add them like this:
the name of the component, string to describe it.
exactly like the add u have in comments.
the exception is for the add(b) with no string describing it.
add(Component,String) is the right way for cardLayout.
the reason u need the string is that u can later switch to that card using the name u gave it.
Consider Paul's rocket mass heater.
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