Qprocess never ends

[mrdebug]

In a Raspberry machine, when I execute
QPSnap->start("Snap");
the script Snap never ends. Finally I obtain the error
QProcess: Destroyed while process ("/home/pi/MultimediaPet/Snap") is still running.
but the script contains only one line:
#!/bin/bash.
The problem happens with all the executables.
How can I resolve?