internal error 500

Sorry for my English as I'm working on a project to manage a CRM, I changed the index.php file in my test environment for the real environment, to run and go to the website I figure the error (error 500 internal server).

They are all correct permissions on my virtual server.

I go back to change the index.php file which originally had (the original file is in HTML). and no problem, directs me to my local server page.

I do not know where my failure.

Thank you so much.

send original file (running)

and test.

8585._index.php.zip

3652._index.php.zip