IUP 'TreeSetUserId' problem in Ubuntu

[bhou <enstb.bhou@...>]

Hi,
   I have a program based on IUP under windows. It works very well. 
Recently, I installed ubuntu 10.04 in my laptop. But I found that the 
same program failed with an 'attempt to index a nil value' error from 
the 'TreeSetUserId' method.  Does any one meet the same problem? Thanks.

Here is the stack traceback:

attempt to index a nil value
stack traceback:
    [C]: in function 'TreeSetUserId'
    ./app/PL2sCF/widgets/CExplorer.lua:757: in function 'setCollaboration'
    ./app/PL2sCF/CLayout.lua:147: in function 
<./app/PL2sCF/CLayout.lua:144>
    (tail call): ?
    [C]: in function 'MainLoop'


Bo