@aaronpriest according to Popov’s tutorial videos, “-” or “_” will work the same. However, I have tested both and still have the same error.
@Alan Northam, I fixed the issue by removed additional space after “^”. From the screen, we can’t see the space/s but after removed any spaces then it worked. I think this simple mistake can happen to new user. I hope it is added to FAQ or user documents.