Uncaught exception thrown in session handler.

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'alr_pr78.sessions' doesn't exist: SELECT 1 AS expression FROM {sessions} sessions WHERE ( (sid = :db_condition_placeholder_0) AND (ssid = :db_condition_placeholder_1) ); Array ( [:db_condition_placeholder_0] => P_Nu5W088aJnBNesDJtOJSKbzgjv_7kIG8t48M5cYpI [:db_condition_placeholder_1] => P_Nu5W088aJnBNesDJtOJSKbzgjv_7kIG8t48M5cYpI ) in _drupal_session_write() (line 212 of /var/www/html/includes/session.inc).