gives an error!!!!

[emre]

hello,i am using phex_2.1.4.80 on fedora core 3.When i run the program,after a while, it gives an error on the terminal then phex locks.İ cont to anyting.i wrote the error below.what does it mean?

Couldn't execl robot child process: Permission denied

in addition my output of "java -version" is below;

java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)

what must i do??
must i write my ip to "ip filter export" section?
thanks....