Strange problem connecting to LinkedIn

So I installed the 'linkedin' gem, an oauth wrapper allowing you to
connect to LinkedIn. I followed this tutorial
quite fastidiously, and was successful in pulling and saving
authentication token and the authentication secret to the database.

So in a different method, I call create a new LinkedIn client, call
client.authorize_from_access, and then try to access client.profile.
Here things melt down, and I get a very peculiar "uninitialized constant

I also ran the example code
off github in console, and got the same error. I've spent a good many
hours trying to figure this out, but to no avail. Any help would be
appreciated! Thanks!