Error message

• Notice: unserialize(): Error at offset 2 of 17 bytes in variable_initialize() (line 1252 of C:\Apache24\htdocs\Drupal-Sites\chemunity\includes\bootstrap.inc).
• Notice: unserialize(): Error at offset 2 of 17 bytes in variable_initialize() (line 1252 of C:\Apache24\htdocs\Drupal-Sites\chemunity\includes\bootstrap.inc).