`exec': wrong number of arguments (ArgumentError) when using bundle exec

[Distriker]

Hi! I'm trying to make a migration, but when I do "rake db:migrate" tell me this:

You have already activated rake 0.9.2, but your Gemfile requires rake 0.8.7. Consider using bundle exec.

Then, I use a bundle exec, but I have other error:

`exec': wrong number of arguments (ArgumentError)
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/cli.rb:346:in `exec'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `send'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `run'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/base.rb:389:in `start'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/bin/bundle:13
from /usr/bin/bundle:19:in `load'
from /usr/bin/bundle:19

Anyone know why show me this error? 

Regards, Iván

[Chirag Singhal]

When it says try using bundle exec... it means that you have to prefix the command with that

Use it like this 'bundle exec rake db:migrate'

[Iván Hernández]

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Yes, I understand. Thanks!

Regards, Iv�n