OSError in Popen

[René 'Necoro' Neumann]

Exception in thread "Waiting Thread #1 (called by:<bound method EmergeQueue.sync of <portato.gui.queue.EmergeQueue instance at 0x33204d0>>)":
Traceback (most recent call last):
  File "//usr/lib64/python2.5/site-packages/portato/gui/utils.py", line 42, in run
    Thread.run(self)
  File "/usr/lib64/python2.5/threading.py", line 446, in run
    self.__target(*self.__args, **self.__kwargs)
  File "//usr/lib64/python2.5/site-packages/portato/gui/queue.py", line 415, in __emerge
    sub_emerge(command)
  File "//usr/lib64/python2.5/site-packages/portato/plugin.py", line 415, in wrapper
    ret = func(*args, **kwargs)
  File "//usr/lib64/python2.5/site-packages/portato/gui/queue.py", line 368, in sub_emerge
    self.process = Popen(command+options+packages, shell = False, env = system.get_environment(), preexec_fn = pre)
  File "/usr/lib64/python2.5/subprocess.py", line 594, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.5/subprocess.py", line 1091, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Portato version: 0.11.1
Python version: 2.5.2 (r252:60911, Nov 25 2008, 10:54:59)
[GCC Intel(R) C++ gcc 4.1 mode]
Used backend: Portage 2.1.4.5
pygtk: 2.13.0 (using GTK+: 2.14.4)
pygobject: 2.15.4 (using GLib: 2.18.2)