Same issue, but I finally got it working by reinstalling RVM.
I didn't have much luck trying the solutions posted in the issues for this:
https://github.com/rvm/rvm/issues/2385
https://github.com/rvm/rvm/issues/4378
Nor with (re)installing RVM through Homebrew. I'm on macOS High Sierra 10.13.4 (17E199). Here are my notes:
# uninstalling RVM: https://stackoverflow.com/a/4747195/539149
rvm implode
# then delete all mentions of RVM in ~/.bashrc ~/.bash_profile ~/.profile ~/.zshrc
# installing RVM: http://usabilityetc.com/articles/ruby-on-mac-os-x-with-rvm/ https://rvm.io/rvm/install
gpg --keyserver hkp://pgp.mit.edu --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
brew tap --repair
curl -sSL https://get.rvm.io | bash -s stable --ruby
# add RVM to bash profile (usually in one of ~/.bashrc ~/.bash_profile ~/.profile ~/.zshrc)
nano ~/.bashrc
###
# Add RVM to PATH for scripting. Make sure this is the last PATH variable change.
export PATH="$PATH:$HOME/.rvm/bin"
# Load RVM into a shell session *as a function*
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
###
# reload shell settings
source ~/.bash_profile
# upgrading RVM: https://rvm.io/rvm/upgrading
rvm get stable
I realize this isn't the greatest solution if you're in the middle of a project that's on fire (or maybe it is?). But I think it's helpful to always have idempotent snippets that you can apply to remedy a situation, then optimize things later.