ERROR after installation

Hi all, I followed the instructions for installing the theme in a fresh drupal installation. Created the database and changed the name, user and psw settings in settings.php. Database name is parischa_jolly Going to the site i get the following error: PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'parischa_jolly.dr_semaphore' doesn't exist: SELECT expire, value FROM {semaphore} WHERE name = :name; Array ( [:name] => variable_init ) in lock_may_be_available() (line 167 of /home/parischa/public_html/includes/lock.inc). Could you help me please? Thanks