About Channel * Report Expected a type error

Amount, today a lot of problems ...
Problem Description: I created as a way

 - (BOOL) insertOneChannel: (Channel *) channel; 

Then an error, the error message is: Expected a type (expected type)
Did not understand that this Channel is to be imported, the statement or loud noise? Hope Answers
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Channel? This is the class you customize it. Certainly before the first import custom class using Yeah.
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Oh, though do not understand, but someday will read it. Support your sister. . .
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Temporarily not get to know, and then after they get to know the supplement Come
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Channel is a class that you want to refer to this class is to have a statement, c language which is include, objc which is import, such as import "Channel.h", otherwise the compiler will report Expected a type
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references, 4th Floor reply:

Channel is a class that you want to refer to this class is to have a statement, c language which is include, objc which is import such import "Channel.h", otherwise the compiler reported Expected a type

Oh. So ah. Thank ixfly answer, thank you, have posted a knot, so you can not have scores of awards, only a verbal thank you for your answer, Oh