[Rails] Failed to run migration

i have a migration but after running it (rake db:migrate),it created
a table "posts" but couldn't create columns.

class CreatePosts < ActiveRecord::Migration
def self.up
create_table :posts do |t|
t.string :name
t.string :title
t.text :content
t.timestamps
end
end
def self.down
drop_table :posts
end
end

Please help!!

John

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