firstkey is not defined

[liamthespy]

I am working on my first custom story, and the basis of the first area is you need a key to get through a door. the key is called firstkey and the door is called firstdoor and I followed this tutorial; http://www.youtube.com/watch?v=T4k5ILstU...ure=relmfu

Basically, when I try to run the custom story it doesn't have a description even though I have made a description for it in the extra_english.lang file and when I try and run it amnesia closes saying firstkey is not defined.

I checked the lang file with a tool from the HPL editor wiki and it said there were no errors, any help please?