I'm getting a HTTP 500 error. How to solve this?

I've activated MAMP. Have the files inside my folder: ABC123 . I've checked all other threads regarding this problem and some more. Can't figure it out. I'm working on my chrome browser and this is the error I get:

The localhost page isn’t working localhost is currently unable to handle this request. HTTP ERROR 500

This is the setup:

functions.php: <?php

function wpt_theme_styles() {

wp_enqueue_style( 'foundation_css', get_template_directory_uri() . '/css/foundations.css' );
wp_enqueue_style( 'normalize_css', get_template_directory_uri() . '/css/normalize.css' );
wp_enqueue_style( 'normalize_css', 'http://fonts.googleapis.com/css?family=Asap:400,700,400italic,700italic' );
wp_enqueue_style( 'main_css', get_template_directory_uri() . '/style.css' );

} add_action( 'wp_enqueue_scripts', 'wpt_theme_styles' );

function wpt_theme_js() {

wp_enqueue_scripts( 'modernizr_js', get_template_directory_uri() . '/js/modernizr.js', '', '', false );
wp_enqueue_scripts( 'foundation_js', get_template_directory_uri() . '/js/foundation.js', array('jquery'), '', true );
wp_enqueue_scripts( 'main_js', get_template_directory_uri() . '/js/app.js', array('jquery', 'foundation_js'), '', true );

} add_action( 'wp_enqueue_scripts', 'wpt_theme_js');

?>

index.php: <?php get_header(); ?>

<h1>Index file</h1>

<?php get_footer(); ?>

header.php <p>Header</p>

footer.php <p>Footer</p>

Let me know if I should include the css&js folder & style.css file in this question.

Thank you so much

Can you help Rich Bagley / Zac Gordon ?