[GRASSLIST:3610] nviz problem

[elias at ipgp.jussieu.fr]

when launching the NVIZ programm i get this error message:

ERROR: window name "wait_ok" already exists in parent
child process exited abnormally
    while executing
"exec /usr/local/grass5/etc/nviz2.2/NVWISH2.2 -f /usr/local/grass5/etc/
nviz2.2/scripts/nviz2.2_script -q -name NVIZ >&@stdout"
    ("eval" body line 1)
    invoked from within
"eval exec $env(GISBASE)/etc/nviz2.2/NVWISH2.2 -f $env(GISBASE)/
etc/nviz2.2/scripts/nviz2.2_script $argv -name NVIZ >&@stdout"
    invoked from within
"if {$argv == ""} {
#no arguments 
eval exec $env(GISBASE)/etc/nviz2.2/NVWISH2.2 -f $env(GISBASE)/
etc/nviz2.2/scripts/nviz2.2_script -name NVIZ >&@stdo..."
    (file "/usr/local/grass5/bin/nviz" line 13)

can someone tell me what to do?

thx