You might get this error if you're using Rails Edge: **config.breakpoint\_server has been deprecated and has no effect**:
To fix the error we need to remove the following from **config/environments/development.rb**:
```ruby
config.breakpoint_server = true
```
Next install ruby-debug:
```ruby
gem install ruby-debug
```
Then add this to the end of **config/environments/development.rb**:
```ruby
require 'ruby-debug'
```
Next, start your server, and the error should be gone...
To debug your code just add a call to **debugger**:
```ruby
class MySillySpace ...
def create
debugger # add this line
end
```
Now when you access the URL with your browser you'll have access to the debugger from the console window.
To learn how to use ruby-debug, read [this tutorial](http://www.datanoise.com/articles/2006/07/12/tutorial-on-ruby-debug) written by the ruby-debug author.