That's because you are using the original original (the un-edited version).
I made the corrections in a different topic and posted the CS there.
Zacharybinx34 saw a need to make a new topic on this and take the altered file here (for whatever reason of clarity).
http://www.thebuddyforum.com/honorbuddy-forum/plugins/free/uncataloged/22270-%5Bplugin%5D-stuckhelper-improved-stuck-handling-4.html#post298567 is where the changes are posted and the modified Stuckhelper.cs is attached as well (not the attachment of lofi in the first post but my attachment. This link should bring you straight to that post).
I actually assumed Zach would have attached my modified version here tbh.
But if you get those compiler errors it means he attached the wrong version?