while trying to install ZLM server
i got this error message

Installing Component 1 of 10: Server Dependencies
Installing Server Dependencies | | 0% Resolvable not found
Traceback (most recent call last):
File "/home/ZLMIR/data/zlminstall.py", line 561, in ?
File "/home/ZLMIR/data/zlminstall.py", line 434, in main
downloadID, transactID = zmd.transact(packages, None)
File "/home/ZLMIR/data/ZLMZMDLib.py", line 413, in transact
return(downloadID, transactID)
UnboundLocalError: local variable 'downloadID' referenced before assignment

can you please help me
my system configuration is
uname -a
Linux hostname #1 SMP Thu May 17 14:00:09 UTC 2007 i686 i686 i386 GNU/Linux