undefined method `write_inheritable_attribute' for Rails::Generator::Base:Class (NoMethodError)

Question

I am working on rails, suddenly rails server stops working. It\'s working fine and I have used following command [platform windows 7]

gem install -v=2.3.5 ra         


        

Answer 1

(@jeremy-f and @alex-villa are on the right track to identifying the problem itself.)

The problem here is that the rails ... command in Rails version 2 is a generator, equivalent to rails new ... in Rails 3+. So rails s is a Rails 2 command to generate a new Rails 2 app called "s" (whereas most of us when we write rails s intend the Rails 3 usage, i.e. start a server!)

If you install a gem, it will usually install its binary in the path, so you should be able to cause this error by doing gem install rails -v 2.3.15 then rails s as the OP says.

Three ways to fix it:

• gem install rails to install a newer version of Rails (you may have to specify a version >= 3.0)
• Run the app with bundle exec rails s (only if you have Rails 3 in your Gemfile)
• The usual way to run a Rails 2 project is simply script/server