This is a common question, but none of the answers seem to solve the issue. I get the usual: You have already activated rack 1.4.1, but your Gemfile requires rack 1.3.6. Using bundle exec may solve this.

Clearing the Gemlock file did nothing and running bundle install again did nothing...running bundle install --binstubs did not solve the issue as "run ./bin/{rake|rails|etc} from your app root" just caused more errors. Is there a way to get rack around this apparently common problem?

ruby-on-rails rack
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