keithsuperk

I was able to resolve this by editing the codemirror-2.php as follows:

<?php
/*
Plugin Name: Codemirror 2 editor
Version: 0.1
Author: Bj?rn Ali G?ransson
Author URI: https://www.bedr.se/
*/

function load_codemirror2() {
  wp_enqueue_script("codemirror_1", "/wp-content/plugins/codemirror-2/scripts/codemirror-compressed.js", array("jquery"));
  wp_enqueue_script("codemirror_2", "/wp-content/plugins/codemirror-2/scripts/main.js", array("jquery"));
  wp_enqueue_style("codemirror_1", "/wp-content/plugins/codemirror-2/styles/codemirror.css");
  wp_enqueue_style("codemirror_2", "/wp-content/plugins/codemirror-2/styles/main.css");
}
add_action('admin_enqueue_scripts', 'load_codemirror2');