What does this OpenFeint Developer Warning mean?

I get the开发者_运维问答 following OpenFeint iOS warning:

OpenFeint Developer Warning:

Please make sure to provide a delegate to OpenFeint

Here is also a screenshot of the warning:

what does this warning means?

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There is some OpenFeint class that you have an instance of, of which you need to set the delegate property to one of your classes that implements the delegate protocol before using the class.