[Matplotlib-users] Problem with vlines ... and tcl !!!

Hello,

    I try 'vline_demo' in directory 'example' and I have problem
    with vlines ... error : "rank-O array has no length". I try
    also with hlines and I have the same problem ...

    I also this error with all the demo :
    error reading package index file
    C:/Python23/tcl/tix8.1/pkgIndex.tcl: invalid command name "lt}]}"

    Have you a explanation ?
         
         Thank you very for your help
         (I work with python 2.3 / windowXP)
                Philippe