bsmith4sj If you're getting the name error when copying the example, it sounds like something got messed up with dat. Is the same thing happening with the example code right above it?
You could also try running the downloading/importing code again in 1.0 to see if the problem persists after that.
If neither of those work, what's the output of running colnames(dat) ? (should show all of the names of the columns in dat)
Edit to add: I just noticed that your title says subset, but in 1.3 you should be using select. Which one are you using?