Problem with custom class, 5000 error

programming flash
1

I’m trying to get into proper OOP in AS, and the first thing I’ve tried to do is to make an improved textfield class that has a easy to use constructor and a method for clearing default text on focus. I’ve had quite a few problems, but this one I’m not able to solve on my own. I’m getting this error:

inputBox.as, line 1 5000: The class ‘inputBox’ must subclass ‘flash.display.MovieClip’ since it is linked to a library symbol of that type.

Now the weird thing is that I have nothing in the library of anything, and I am infact importing the mentioned subclass. I’ve tried commenting code out to no avail, and this is what I’m currently left with:

package {
        import flash.display.MovieClip;
        import flash.events.*;
        import flash.text.*;

        public class inputBox {
    }
}

I might be missing something obvious, but I’m just out of ideas.
Cheers