Help With Modding

[Spooder Wekd]

Hey, I like to design games in my spare time. It is a hobby that I like to think that I have become good at. So when I heard Penumbra was going open source, I decided to dive in. Now, I have read through the tutorials (seeing as I am somewhat new to 3D level design) and when I tried to view the box model from the first tutorial, HPL helper came up with an error message saying: "Couldn't load mesh" I tried loading the models that come with the game and they worked perfectly. So I am totally dumbfounded. Any help would be appreciated and I look forward to showing off what I make. (I intend to make an entire game, or close to it.)

PS: Sorry, I was not sure whether to put this in the modding or tech support section...