Removing a moveclip

What i want to happen seems quite simple yet i keep getting the error “access of undefined property” when what i’m trying to remove is in fact defined in the same class but it obviously cannot gain access to it.

I want to remove a MovieClip from the stage once a button has been clicked.
The MovieClip is created in the same class as my button function i created. The button works fine but whatever i try to put within the function to remove the MovieClip cause the error i mentioned at the start.

Any pointers of the different ways of doing this? Any help would be appreciated.