1195: Attempted access of inaccessible method start through a reference with static t

Hiya,

This .as file was working fine yesterday and now Im getting this error.
Any one hav any ideas, they would be greatly appreciated.

package classes
{
    import flash.display.MovieClip;
    import classes.RollableChar;

    
    public class MainApp2 extends MovieClip
    {
        private var rolly:RollableChar;        // Decalaring an object...
        
        public function MainApp2()
        {
            
            // 1. Create a RollableChar...        
            rolly = new RollCharacter();        // Instantiate the object...
            
            
            // 2. Add this to the stage...
            this.addChild(rolly);
            
            // 3. Position the Character correctly...
            rolly.x = 20;
            rolly.y = 310;
            
            // 4. Start the character...
            rolly.start();
        }
}
}