how to solve this warning

c:\redmine1-1-1/redmine-1.1.1>rake db:migrate rails_env="production"
WARNING:'task:t,arg,:needs =>[deps]'is deprecated.Please use 'task:t,[args]=>[deps]'instead.at C:/redmine1-1-1/redmine-1.1.1/lib/tasks/email.rake:170
rake aborted!
uninitialized constant activerecord::actiondispatch