如何在XAMPP上设置cakephp站点

I have downloaded a PHP site developed in cakephp and now trying to set up it in XAMPP.

I was having some problems related to .htaccess and cakephp path. I renamed .htaccess files to 1.htaccess and defined hard coded path of cake root folder in one of the .php files so those errors are gone. But now I get new error which is:

HTTP ERROR 500

How do I display full error so I know exactly what's going on?

Display Errors setting is already defined in php.ini

display_errors = On

Directory structure is as follows. May be I am not trying to access correct file? I am trying to access:

http://localhost/mysite/public_html/app/

Even if I try to access webroot, get same error

http://localhost/mysite/public_html/app/

Directory structure given below.

How do I fix this issue?