[CentOS] system-config-printer wont start

Hello All. Anyone know what the cause of this error is in Centos 4?

$ system-config-printer Traceback (most recent call last): File "/usr/sbin/system-config-printer", line 9, in ? import queueTree File "/usr/share/printconf/util/queueTree.py", line 1236, in ? queueTree() File "/usr/share/printconf/util/queueTree.py", line 138, in __init__ if cups_import.import_needed (): File "/usr/share/printconf/util/cups_import.py", line 200, in import_needed which = which_spooler () File "/usr/share/printconf/util/cups_import.py", line 195, in which_spooler return which UnboundLocalError: local variable 'which' referenced before assignment