How to remote debug a rails application

I have a rails which I start at localhost port 9000 (0.0.0.0:9000). I want to debug the entire rails app (as in not a particular file but the entire project). Following are the steps I followed -

Set up a edit configuration with following parameters - 

• Server command - rdebug-ide --host 0.0.0.0 --port 8000 --dispatcher-port 26162 --$COMMAND$
• remote host - 0.0.0.0
• remote port - 8000
• remote root folder - /home/user/project
• local port- 26162
• local root folder - /home/user/project

Run the rails server as - rdebug-ide --host 0.0.0.0 --port 8000 --dispatcher-port 26162 -- rails s -p 8000

I a unable to attach to the debugger and I am getting the error  - 

Local root is not specified or incorrect.

How do I resolve this?