Unfamiliar compiler message

I'm trying to add some ADTs to corresponding vectors and test my toString() function. When I build the project, I get the compiler message --

Code:

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1>c:\users\sterling\documents\visual studio 2008\projects\building\building\building.cpp(54) : error C2664: 'void Bathroom::addShower(Shower)' : cannot convert parameter 1 from 'Shower (__cdecl *)(void)' to 'Shower'
1>        No constructor could take the source type, or constructor overload resolution was ambiguous

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That is just the first message for room.addShower(one);
I get a message for each attempt to add.

My main code is just

Code:

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        Bathroom room;
        Shower one();
        Shower two();
        Stall three();
        Stall four();
        Stall five();
        Mirror six();
        Sink seven();
        room.addShower(one);
        room.addShower(two);
        room.addStall(three);
        room.addStall(four);
        room.addStall(five);
        room.addMirror(six);
        room.addSink(seven);
        cout<<room.toString();

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I'm pretty lost when I read the compiler message, what is it trying to tell me?

Nevermind, the () after Shower one, Shower two, etc was the problem.

Just to reiterate what happened - the () makes it a forward declaration: not a variable declaration.