I have seen many
You have already activated rake 0.9.x, but your Gemfile requires rake 0.x.x
errors.
Of course, they can be solved (temporarily or always) by some methods like the following.
bundle exec rake
The method above works but you always have to type bundle exec.
It can also be solved by
bundle update
But bundle update also updates your other gems.
Some say it can be solved by
gem uninstall unwanted_rake_version
Yes, the unwanted rake can be installed but it is still marked as activated thus, still giving the error.
One solution would be to explicitly specify the rake version in your Gemfile but, that is not the question. It is on how to set the default rake version, or activate that specific version in rvm or other types of ruby installations?