"Could not find bundler" error
Make sure you're entering "bundle" update, if you have the bundler gem installed.
bundle update
If you don't have bundler installed, do gem install bundler.
I had this problem, then I did:
gem install bundle
notice "bundle" not "bundler" solved my problem.
then in your project folder do:
bundle install
and then you can run your project using:
script/rails server
I had the same problem. This worked for me:
run rvm/script/rvm and also add it to your .profile or .bash_profile as shown in https://rvm.io/rvm/install/
use bundle without sudo