rails server bin/rails:6: warning: already initialized constant APP_PATH error

Question

I\'ve tried a number of things like uninstalling/reinstalling rails and gems but to no avail.

When I go into my new project and run rails s or bundle exec rails serv

Answer 1

My problem was I was using an outdated version of ruby 1.9.3 with rails 4.2. I upgraded to 2.1.2 , removed the broken project, ran rails new blog to recreate my project, navigated into my newly created app and ran rails server and it worked.

Answer 2

I just had this problem and found that it was being caused by the fact that I had removed a gem from the gemfile without deleting the other require references. In my case, I just had to remove it from config/application.rb.

Answer 3

This is work for me.

gem uninstall mysql2

bundle install or gem install mysql2

Answer 4

IF rake rails:update:bin gives additional errors:

I had recently been doing some server maintenance and had subsequently updated OpenSSL.

When I tried running the rake rails:update:bin command, I was presented with an error relating to openSSL.

Having rebuilt my version of Ruby (`rvm reinstall ruby-x.x.x' with RVM), both errors went away.

This is always worth a try I guess.

Answer 5

I was getting the same error. Removed spring from Gemfile and re-bundled. Not really a solution though.

I found the code that created this error in config/initializers/an_initializer.rb

require "lib/a_file_i_need"

I changed it for

require "#{ Rails.root }/lib/a_file_i_need"

Answer 6

rake rails:update:bin to the rescue.