Flash errors as soon as I add action script

What does this error mean?

5000: The class 'com.jumpeye.flashEff2.symbol.equalizer.FESEqualizer' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.

I have a flasheff effect on my logo. After the effect plays I have action script that will allow users to enter the site once the enter button is clicked. It doesn't work because I keep getting that error. Here is my script. It works with all my other files but will not work with the Flasheff for some reason. Please help

// enterbtn Click function
function enterbtn(event:MouseEvent):void {
enterbtn.gotoAndPlay("click"); // go into enterbtn movieclip and play the click frame label


MovieClip(root).gotoAndPlay("intro");
}
enterbtn.addEventListener(MouseEvent.CLICK, enterbtnClick);