Error message

• Notice: unserialize(): Error at offset 34 of 56 bytes in variable_initialize() (line 1252 of /var/www/drupal7/html/includes/bootstrap.inc).
• Notice: unserialize(): Error at offset 43 of 65 bytes in variable_initialize() (line 1252 of /var/www/drupal7/html/includes/bootstrap.inc).
• Notice: unserialize(): Error at offset 1024 of 5132 bytes in variable_initialize() (line 1252 of /var/www/drupal7/html/includes/bootstrap.inc).
• Notice: unserialize(): Error at offset 351 of 493 bytes in variable_initialize() (line 1252 of /var/www/drupal7/html/includes/bootstrap.inc).
• Notice: unserialize(): Error at offset 36 of 54 bytes in variable_initialize() (line 1252 of /var/www/drupal7/html/includes/bootstrap.inc).