Phusion Passenger Error: You have activated rack 1.2.1, but your Gemfile requires rack 1.2.2

Question

I\'m trying to run a Ruby on Rails app on a Dreamhost shared server. All is well so far except one weird bug I have not been able to unravel.

Sometimes when I visit

Answer 1

I solved this way on Dreamhost:

Remove from Gemfile any line: gem 'rack', ....

rm Gemfile.lock
rm -rf .bundle
rm -rf  vendor/bundle

install / use the gems locally and regenerates the file 'Gemfile.lock' with:

bundle install

install gems in vendor/bundle

bundle install --deployment

restart:

touch tmp/restart.txt