Masking Movieclips

Hello everybody!
Is it possible to apply masks to a movieclip?
I tried it without success.
The idea is the following:
i have a button that each time it is pressed, the next frame of a movieclip is shown.
Problem is i NEED to apply a mask to that movieclip, but terminal prints an error.
what can i do????
Cheers!

views:1490 update:2011/11/25 8:45:21
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