Error launching Rails server: undefined method ‘configure’

I resolved it by doing following step. Step 1: go to Project_Root_Directory/config/environment/development.rb Change this line Rails.application.configure do To Your_Rails_Application_Folder_name::Application.configure do For example my rails project folder name is ‘Spree_demo’ so Your_Rails_Application_Folder_name in the following line: Your_Rails_Application_Folder_name::Application.configure do will be replaced as SpreeDemo::Application.configure do Note: See underscore in your application folder name it gets removed. Hope … Read more