HELP!Error :NO child processes in LTTV (linux trace toolkit viewer)

Error message comes when i press START button in lttv-gui :No child
processes
and another message show : No such file or directory when pressing the
STOP

I successfully patched the kernel and compiled Lttng following the user
guide. The thing i feel strange is that i can't find ltt-core and
ltt-relay modules but i thouht they were built in kernel.

This is the error message.
*****************************************************************************************************************
Executing (as root) : exec /usr/local/bin/lttctl -l /mnt/relayfs/ltt -t
/tmp/trace1 -n trace -m normal -d -N 1
Linux Trace Toolkit Trace Control

Controlling trace : trace

Linux Trace Toolkit Trace Daemon

Reading from relayfs directory : /mnt/relayfs/ltt/trace
Writing to trace directory : /tmp/trace1

signal 17 received
Error in waitpid: No child processes
Trace start error


** (lttv.real:28910): WARNING **: An error occured in the su command :
No child processes

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