add following lines below "export PATH="$PATH:$HOME/.rvm/bin" # Add RVM to PATH for scripting" into ~/.profile

export GEM_PATH="/Users/spond/.rvm/gems/ruby-2.2.0"

export GEM_HOME="/Users/spond/.rvm/gems/ruby-2.2.0"

export PATH="$GEM_HOME/bin:$PATH"

then run command:

source ~/.bash_profiile

make sure that the GEM_HOME at the first location of PATH.

How to fix the issue that GEM_HOME and/or GEM_PATH not set issue for rvm in mac version 10.12