[themes] Error

*Hello all, I am getting following error in drupal while clicking on "Administer" module. Fatal error*: Allowed memory size of 8388608 bytes exhausted (tried to allocate 11520 bytes) in * /opt/lampp/htdocs/drupal-5.9/modules/system/system.install* on line *2790 Can anybody tell me about how to solve this error. Regards, Vishakha. *