A member attribute was used incorrectly

I want to load an image inside a class. This is my class:

class B
{
private mclListener:Object;
private image_mcl:MovieClipLoader;

function B() {
createEmptyMovieClip("image_mc", getNextHighestDepth());
mclListener = new Object();
mclListener.onLoadInit = function(target_mc:MovieClip) {
image_mc._width = 100;
};
image_mcl = new MovieClipLoader();
image_mcl.addListener(mclListener);
}

public function loadit() {
image_mcl.loadClip("pic.jpg", image_mc);
}
}


This is my fla:
var theB:B = new B();
theB.loadit();

I get the following errors:
B.as: Line 3: A member attribute was used incorrectly.
public mclListener:Object;
B.as: Line 4: Attribute used outside class.
public image_mcl:MovieClipLoader;

What do these mean?
How do I load image inside a class?