can not create a user

[rezaa1]

When I try to create account it fails, and rollback

Loading production environment (Rails 5.0.1)
irb(main):001:0> Account.create(email: "my@email.com", password: "yourpassword", password_confirmation: "yourpasword")
(0.3ms) begin transaction
Account Exists (0.6ms) SELECT 1 AS one FROM "accounts" WHERE "accounts"."email" = ? LIMIT ? [["email", "my@email.com"], ["LIMIT", 1]]
(0.3ms) rollback transaction
=> #<Account id: nil, email: "my@email.com", created_at: nil, updated_at: nil, authentication_token: nil>
irb(main):002:0>

I tried different emails, but still failng