Having trouble with the Invpane2 library

Okay so someone gave my a source code of a game they made to look at.
It uses the Invpane2.aslx Library, it also use the Invpane2.Js code. I have put both of those into the project and I get know errors until I start the game.
Apparently it's having trouble establishing what the SetInventory2Label fuction is which is part of the library. I don't understand I loaded the Invpane2 library and the javascript file which is called in a function in the code.
Here is a link to the library code, and the documentation about it.
So why isn't it working?

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