Больше не могу получить доступ к Rails после установки Oh-my-zsh

Недавно я настроил oh-my-zsh, но теперь я не могу получить доступ к Rails в своей командной строке (и zsh, и bash выдают мне ошибку, говорящую, что у меня не установлены рельсы, и мне нужно установить). Я уже устанавливал и довольно много работал с рельсами в прошлом до установки oh-my-zsh.

My .zshrc:

# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH=/Users/Alex/.oh-my-zsh

export PS1="\w \$(parse_git_branch)"

# Set name of the theme to load. Optionally, if you set this to "random"
# it'll load a random theme each time that oh-my-zsh is loaded.
# See https://github.com/robbyrussell/oh-my-zsh/wiki/Themes
ZSH_THEME="awesomepanda"

# Imports nvm from bash profile
export NVM_DIR="$HOME/.nvm"
. "/usr/local/opt/nvm/nvm.sh"

export RBENV_ROOT=/usr/local/var/rbenv
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

# Uncomment the following line to use case-sensitive completion.
# CASE_SENSITIVE="true"

# Uncomment the following line to use hyphen-insensitive completion. Case
# sensitive completion must be off. _ and - will be interchangeable.
# HYPHEN_INSENSITIVE="true"

# Uncomment the following line to disable bi-weekly auto-update checks.
# DISABLE_AUTO_UPDATE="true"

# Uncomment the following line to change how often to auto-update (in days).
# export UPDATE_ZSH_DAYS=13

# Uncomment the following line to disable colors in ls.
# DISABLE_LS_COLORS="true"

# Uncomment the following line to disable auto-setting terminal title.
# DISABLE_AUTO_TITLE="true"

# Uncomment the following line to enable command auto-correction.
# ENABLE_CORRECTION="true"

# Uncomment the following line to display red dots whilst waiting for completion.
# COMPLETION_WAITING_DOTS="true"

# Uncomment the following line if you want to disable marking untracked files
# under VCS as dirty. This makes repository status check for large repositories
# much, much faster.
# DISABLE_UNTRACKED_FILES_DIRTY="true"

# Uncomment the following line if you want to change the command execution time
# stamp shown in the history command output.
# The optional three formats: "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
# HIST_STAMPS="mm/dd/yyyy"

# Would you like to use another custom folder than $ZSH/custom?
# ZSH_CUSTOM=/path/to/new-custom-folder

# Which plugins would you like to load? (plugins can be found in ~/.oh-my-zsh/plugins/*)
# Custom plugins may be added to ~/.oh-my-zsh/custom/plugins/
# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
plugins=(git z h take)

source $ZSH/oh-my-zsh.sh

# User configuration

# export MANPATH="/usr/local/man:$MANPATH"

# You may need to manually set your language environment
# export LANG=en_US.UTF-8

# Preferred editor for local and remote sessions
# if [[ -n $SSH_CONNECTION ]]; then
#   export EDITOR='vim'
# else
#   export EDITOR='mvim'
# fi

# Compilation flags
# export ARCHFLAGS="-arch x86_64"

# ssh
# export SSH_KEY_PATH="~/.ssh/rsa_id"

# Set personal aliases, overriding those provided by oh-my-zsh libs,
# plugins, and themes. Aliases can be placed here, though oh-my-zsh
# users are encouraged to define aliases within the ZSH_CUSTOM folder.
# For a full list of active aliases, run `alias`.
#
# Example aliases
# alias zshconfig="mate ~/.zshrc"
# alias ohmyzsh="mate ~/.oh-my-zsh"
alias reload=". ~/.zshrc && echo 'ZSH config reloaded from ~/.zshrc'"

и мой .bashrc:

export NVM_DIR=~/.nvm
source $(brew --prefix nvm)/nvm.sh

# Git
function parse_git_branch {
  ref=$(git symbolic-ref HEAD 2> /dev/null) || return
  echo "("${ref#refs/heads/}")"
}
export PS1="\[\033[1;32m\][\w]\[\033[1;33m\]\$(parse_git_branch)\[\033[0m\] "
export EDITOR='atom --wait'
export VISUAL='atom --wait'

eval "$(hub alias -s)"

if which rbenv > /dev/null; then
 eval "$(rbenv init -)"
fi

Учитывая эти конфигурации, почему команды Rails больше не работают?

Обновление: вот цепочка ошибок, когда я пытаюсь запустить любую команду rails:

Rails is not currently installed on this system. To get the latest version, simply type:

    $ sudo gem install rails

You can then rerun your "rails" command.

Когда я делаю по инструкции и запускаю sudo gem install rails:

Error installing rails:
    activesupport requires Ruby version >= 2.2.2.

Я пытался обновить Ruby с помощью rbenv, но похоже, что это обновило только Rbenv, поэтому мои попытки просто переустановить рельсы натолкнулись на эту стену.