Error message

• User warning: The following module is missing from the file system: standard. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/theygsgroup/public_html/includes/bootstrap.inc).
• Warning: include_once(/home/theygsgroup/public_html/themes/engines/phptemplate/phptemplate.engine): failed to open stream: No such file or directory in _drupal_theme_initialize() (line 209 of /home/theygsgroup/public_html/includes/theme.inc).
• Warning: include_once(): Failed opening '/home/theygsgroup/public_html/themes/engines/phptemplate/phptemplate.engine' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in _drupal_theme_initialize() (line 209 of /home/theygsgroup/public_html/includes/theme.inc).