`check_conditionals'：不支持在：if和：un条件变量中传递要评估的字符串（ArgumentError）

Question

当我在开发模式下运行Rails服务器时，它将运行。但是，如果我尝试运行RAILS_ENV = production rails服务器，则显示一些错误，我无法解决。 这是我的错误日志：-

=> Booting Puma
=> Rails 5.2.0 application starting in production 
=> Run `rails server -h` for more startup options
Exiting
/home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:355:in `check_conditionals': Passing string to be evaluated in :if and :unless conditional options is not supported. Pass a symbol for an instance method, or a lambda, proc or block, instead. (ArgumentError)
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:301:in `initialize'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:289:in `new'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:289:in `build'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:672:in `block in set_callback'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:671:in `map'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activesupport-5.2.0/lib/active_support/callbacks.rb:671:in `set_callback'
    from /home/sharat/.rvm/gems/ruby-2.4.3/gems/activemodel-5.2.0/lib/active_model/callbacks.rb:131:in `block in _define_before_model_callback'

我的应用程序控制器外观

class ApplicationController < ActionController::Base
  self.responder = ApplicationResponder
  respond_to :html
  before_action :configure_permitted_parameters, if: :devise_controller?
  rescue_from ActiveRecord::RecordNotFound do
    flash[:warning] = 'Resource not found.'
    redirect_back_or root_path
  end
  rescue_from CanCan::AccessDenied do |exception|
    redirect_to role_based_path, :alert => exception.message
  end

 def redirect_back_or(path)
    redirect_to request.referer || path
  end

  def after_sign_in_path_for(resource)
    role_based_path
  end

  protect_from_forgery with: :exception

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:sign_up, keys: [:username])
      devise_parameter_sanitizer.permit(:account_update, keys: [:username, :role])

  end

end