undefined method `seed'

hello, I am trying to deploy a rails 3.1 app to Heroku and need to run db:seed My seeds file has this code

User.seed do |s|   s.email = "temp@temp.com"   s.password = "bigsecret"   s.password_confirmation = "bigsecret" end

Running rake db:seed locally works fine, but after deployment to Heroku I try to run this seed file and get error:

undefined method `seed' for #<Class:0x00000006499ac0>

Any ideas why Heroku does not like my seed file?

thanks

Pls try out this heroku:rake:db:seed

Opps my mistake try out this heroku rake db:seed

heroku:rake:db:seed command does not exist. Are you sure about this sintax?

I did. This is the code that has problems, that I described in first post. Running heroku rake db:seed is what caused the problem in the first place.