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 1156 of /var/www/html/vimaru/web/includes/bootstrap.inc).
• Warning: chmod(): Operation not permitted in _event_css_add() (line 272 of /var/www/html/vimaru/web/sites/all/modules/event_calendar/event_calendar_colors/event_calendar_colors.module).