RStudio: Error on testing documentation with?

Question

I'm using latest RStudio 0.99.879. I'm creating a new project as R Package.

After running (as mentioned on http://r-pkgs.had.co.nz/man.html )

devtools::document()
?.

I get an error

/path/to/my/package/man: Sections \title, and \name must exist and be unique in Rd files 

What's the reason and how can I avoid it?

Edit: I've deleted manually the file man/hello.Rd so roxygen2 can generate it.

Answer 1

Hadley told me "." is the end of the sentence. So there's no magic.