Error: N/A: version "N/A -> N/A" is not yet installed
I got this error after doing nvm use (switching to older Node version 8.11.1, shown in .nvmrc file), nvm uninstall (newer Node version 9.0.0), then a git push.
nvm ls shows my “default” Node version was pointing to the uninstalled one: default -> 9.0.0 (-> N/A). This caused the error.
To fix: nvm alias default node points “default” to the latest installed Node version (8.11.1).
Now nvm ls shows default -> node (-> v8.11.1).