can't open system>settings>system

[wijayamisx]

please help, when i click folder system>settings>system
this error message appears below :

2017-11-05 3:10:13 - error: AbanteCart core v.1.2.11 Call to undefined method DirectoryIterator::getExtension() in <b>/home/sloki/user/k3495742/sites/wijaya.com/www/web/core/lib/cache.php</b> on line <b>614</b>

i used version :
PHP Version 5.3.3-7+squeeze28
Mysql Client API version   5.1.73

thanks in advance