[tryton] Error when trying to print to PDF any report

[Fabyc]

Hello everybody.

I have installed these libs:
apt-get install libreoffice-java-common python-uno 

As a test, in "Administration->User Interface->Actions->Reports" I set the 
"Extension" field the 
option "PDF" for the "Labels" report.

When I tried to print to PDF, I get this error:

Traceback (most recent call last):
  File "/trytond/protocols/jsonrpc.py", line 125, in _marshaled_dispatch
    response['result'] = dispatch_method(method, params)
  File "/trytond/protocols/jsonrpc.py", line 158, in _dispatch
    res = dispatch(*args)
  File "/trytond/protocols/dispatcher.py", line 159, in dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
  File "/trytond/report/report.py", line 128, in execute
    type, data = cls.parse(action_report, records, data, {})
  File "/trytond/report/report.py", line 284, in parse
    data = cls.unoconv(data, report.template_extension, output_format)
  File "/trytond/report/report.py", line 301, in unoconv
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  File "/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/subprocess.py", line 1259, in _execute_child
    raise child_exceptionOSError: [Errno 2] No such file or directory



It is the same error when I try to print to PDF any other report. I tested 
in tryton 3.2, 3.4.

I installed this lib too: "apt-get install unoconv" and the error persists.

Is there something I'm missing?

Thanks in advanced