"Type coercion error" when I'm not coercing types

programming flash
1

Here’s an FLA of what I’m experiencing:

http://spamtheweb.com/ul/upload/310308/6 6135_help.fla
[URL=“http://spamtheweb.com/ul/upload/310308/66135_help.fla”]

I don’t understand it at all. I have two different movieclips with the same name on different frames, and for some reason Flash is exploding. Please help me. I am so confused.