title: How to debug Rails application?
body: <p>I'm new to Ruby on Rails and I'm facing quite a number of logical errors which I'm unaware of. Like a normal programmer, the thing to solve your errors is by debugging it first. May I know how to debug it? Because when i tried doing so, it already shows me an error:</p>
  
  <p>"Uncaught exception: uninitialized constant Object::ApplicationController"</p>
  
  <p>May I know how to solve this error and how to debug? Thanks! :)</p>