issue with 5.0 installation: theme engine error message

Caveat: I'm not a PHP programmer, or anything resembling one...
Thanks very much in advance to anyone who can clue me in.
Drupal seems to be asking for a theme engine that isn't part of the install, as far as I can tell.

I just installed Drupal, and it runs fine except for the fact that I can't edit themes. I get this error message:

Call to undefined function: system_listing() in /home/content/m/m/m/mmm777/html/themes/engines/theme_editor/theme_editor_engine.engine on line 32

After installation, I got this:

Drupal installation complete

user warning: Access denied for user: 'michaelmm@%' to database 'michaelmm' query: CREATE TEMPORARY TABLE missing_nids SELECT n.nid, n.created, n.uid FROM node n LEFT JOIN node_comment_statistics c ON n.nid = c.nid WHERE c.comment_count IS NULL in /home/content/m/m/m/mmm777/html/includes/database.mysql.inc on line 167.

user warning: Table 'michaelmm.missing_nids' doesn't exist query: INSERT INTO node_comment_statistics (nid, last_comment_timestamp, last_comment_name, last_comment_uid, comment_count) SELECT n.nid, n.created, NULL, n.uid, 0 FROM missing_nids n in /home/content/m/m/m/mmm777/html/includes/database.mysql.inc on line 167.

All necessary changes to ./sites/default/settings.php have been made. It has been set to read-only for security.

Congratulations, Drupal has been successfully installed.

Please review the messages above before continuing on to your new site.