This avoids the following error on the main dashboard page:
[06-May-2016 13:13:33 UTC] PHP Fatal error: Call to undefined function post_categories_meta_box() in /srv/www/pluginize/htdocs/wp-content/plugins/Code-Snippets-CPT-pr_1/lib/CodeSnippitButton.php on line 248
This avoids the following error on the main dashboard page:
[06-May-2016 13:13:33 UTC] PHP Fatal error: Call to undefined function post_categories_meta_box() in /srv/www/pluginize/htdocs/wp-content/plugins/Code-Snippets-CPT-pr_1/lib/CodeSnippitButton.php on line 248