"tasks" isn't working

[epitron]

I'm not sure why this is happening:

rails-sh(railsview)> tasks
Unknown show task mode: ''
/usr/lib/ruby/1.9.1/rake/application.rb:237:in `display_tasks_and_comments'
/home/epi/.gem/gems/rails-sh-1.5.2/lib/rails/sh/commands.rb:43:in `block in <top (required)>'
/home/epi/.gem/gems/rails-sh-1.5.2/lib/rails/sh.rb:51:in `call'
/home/epi/.gem/gems/rails-sh-1.5.2/lib/rails/sh.rb:51:in `execute'
/home/epi/.gem/gems/rails-sh-1.5.2/lib/rails/sh.rb:28:in `start'
/home/epi/.gem/gems/rails-sh-1.5.2/bin/rails-sh:28:in `<top (required)>'
/home/epi/.gem/bin/rails-sh:23:in `load'
/home/epi/.gem/bin/rails-sh:23:in `<main>'
rails-sh(railsview)> 

Any ideas?