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Update button doesn't work

I am on the adding avatar section, using rails 4. I successfully added the upload image field. However the "update" button for user/edit doesn't work, but the cancel account button does.Any idea what this could be? model:class User < ActiveRecord::Base # Include default devise modules. Others available are: # :confirmable, :lockable, :timeoutable and :omniauthable devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable

has_many :logs

has_many :reviews

has_attached_file :avatar

validates :name, :presence => true end code snippet I have in my views: <div class="form-group"> <%= f.submit "Update", class: "btn btn-primary" %> </div> <% end %>