I have absolutely no idea what I am doing wrong here. I have followed just about every guide there is with installing cakephp on shared hosting and I am still having problems. I have also started over each time when following a guide. Maybe someone can help me out here as I am out of options.

Here is my current setup:

/
  app
      webroot
  vendors
  lib
      cake
  public_html
      .htaccess
      index.php
  plugins

I have configured the index.php file in the public_html to point to the correct files. I have also done this in the index.php file located in webroot folder. I am getting an Internal 500 server error and it says to check my logs for what the error specifically is. However there are no logs being generated. I removed the .htaccess file from the public_html folder and I get the following errors:

Warning: require(/app/webroot/index.php) [function.require]: failed to open stream: No such file or directory in /home/user/public_html/index.php on line 40

Fatal error: require() [function.require]: Failed opening required '/app/webroot/index.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/user/public_html/index.php on line 40

line 40 is

require APP_DIR . DS . WEBROOT_DIR . DS . 'index.php';

DS = "/"

WEBROOT_DIR = "app"

Anyone have any suggestions? I am at lost at what I am doing wrong.