I got an answer to my question on Stack Overflow: I needed to create the missing version.php file.
Text editors
How do I add a text editor to Moodle 2.9?
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។
I got an answer to my question on Stack Overflow: I needed to create the missing version.php file.