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

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