I'm unable to broadcast the screen

I get this in my console when i try broadcasting the screen. Looking for some solutions , Thankyou

(epoptes:12428): Gtk-WARNING **: Unknown property: GtkMenu.ubuntu-local
Got clients: 192.168.1.168:39218, 192.168.1.168:39276
---
**addClient's been called for 192.168.1.168:39218
  Continuing inside addClient...
* This client is a new one, creating an instance
* I am a root client
---
**addClient's been called for 192.168.1.168:39276
  Continuing inside addClient...
* This is an existing client
* I am a user client, will add clientuser2 in my list
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/epoptes/ui/gui.py", line 306, in broadcastScreen
    self._broadcastScreen('true')
  File "/usr/lib/python2.7/dist-packages/epoptes/ui/gui.py", line 289, in _broadcastScreen
    subprocess.call(['x11vnc', '-storepasswd', pwd, pwdfile])
  File "/usr/lib/python2.7/subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory