You've got your command line options mixed up.
Either do "rpm -e packagename" or "rpm --erase" packagename (Note the DOUBLE dash!). Alternatively, "rpm --erase=packagename". All the same results.
When you only coded a single dash, the command line parser interpreted it as:
So it thought you'd specified an alternate install root ("rase"), which, as it noted, is invalid because the root path must be absolute, and therefore start with "/".
So the following command is actually valid, although I hope no one ever uses it!
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.