When i run drush cc all. I am ending up with ERRO. This drupal is a Vanilla drupal.
PHP Fatal error: Uncaught Error: Call to undefined function cache_get() in /var/www/html/drupal/drupal785/includes/module.inc:754
Stack trace:
0 /var/www/html/drupal/drupal785/includes/module.inc(954): module_implements('system_theme_in...')
1 /var/www/html/drupal/drupal785/modules/system/system.module(2511): module_invoke_all('system_theme_in...')
2 /var/www/html/drupal/drupal785/includes/theme.inc(798): _system_rebuild_theme_data()
3 /var/www/html/drupal/drupal785/includes/theme.maintenance.inc(57): list_themes()
4 /var/www/html/drupal/drupal785/includes/bootstrap.inc(2876): _drupal_maintenance_theme()
5 /var/www/html/drupal/drupal785/includes/errors.inc(179): drupal_maintenance_theme()
6 /var/www/html/drupal/drupal785/includes/bootstrap.inc(2609): _drupal_log_error(Array, true)
7 [internal function]: _drupal_exception_handler(Object(Error))
8 {main}
thrown in /var/www/html/drupal/drupal785/includes/module.inc on line 754
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Uncaught Error: Call to undefined function cache_get() in /var/www/html/drupal/drupal785/includes/module.inc:754
Stack trace:
0 /var/www/html/drupal/drupal785/includes/module.inc(954): module_implements('system_theme_in...')
1 /var/www/html/drupal/drupal785/modules/system/system.module(2511): module_invoke_all('system_theme_in...')
2 /var/www/html/drupal/drupal785/includes/theme.inc(798): _system_rebuild_theme_data()
3 /var/www/html/drupal/drupal785/includes/theme.maintenance.inc(57): list_themes()
4 /var/www/html/drupal/drupal785/includes/bootstrap.inc(2876): _drupal_maintenance_theme()
5 /var/www/html/drupal/drupal785/includes/errors.inc(179): drupal_maintenance_theme()
6 /var/www/html/drupal/drupal785/includes/bootstrap.inc(2609): _drupal_log_error(Array, true)
7 [internal function]: _drupal_exception_handler(Object(Error))
8 {main}
thrown in /var/www/html/drupal/drupal785/includes/module.inc, line 754
Help me to overcome this ERROR