Starting out with Equation Trekker

Hi, I am trying to learn how to use the EquationTrekker package inside Mathematica 10.0.02. As soon as I try and run even the simple example from the documentation centre, I just get a some very strange error messages. I have attached the example Notebook. Any help much appreciated as ever.

Happens to me too, i think this is a bug. The equation trekker does work though…
If the messages annoy you, you could try adding Quiet[ ] around the statement…