You have already activated rake 0.9.6, but your Gemfile requires rake 10.1.0. Using bundle exec may solve this

Before continue reading, I must says that I already read and tried similar questions and answers on google & stackoverflow.

My problem is that:

• bundle install or update does nothing
• gem uninstall rake refuses because rake is a default gem
• I cannot use bundle exec for all my commands

Any other idea ?!