textarea_name is not working with wp_editor
$editor_id (string) (required) HTML id attribute value for the textarea and TinyMCE. (may only contain lower-case letters) http://codex.wordpress.org/Function_Reference/wp_editor The second parameter passed to wp_editor needs to match the id attribute of the textarea, not the name attribute. Your textarea doesn’t even have and id add one, then use that. <textarea id=”mypostcontent” name=”post_content” rows=”10″