I get this error when I start my server

2014-08-07 10:02:40,517 18255 ERROR ? werkzeug: Error on request:

Traceback (most recent call last):

  File "/usr/share/pyshared/werkzeug/serving.py", line 159, in run_wsgi

    execute(app)

  File "/usr/share/pyshared/werkzeug/serving.py", line 146, in execute

    application_iter = app(environ, start_response)

  File "/home/user/odoo/openerp/service/server.py", line 273, in app

    return self.app(e, s)

  File "/home/user/odoo/openerp/service/wsgi_server.py", line 215, in application

    return application_unproxied(environ, start_response)

  File "/home/user/odoo/openerp/service/wsgi_server.py", line 201, in application_unproxied

    result = handler(environ, start_response)

  File "/home/user/odoo/openerp/http.py", line 1096, in __call__

    self.load_addons()

  File "/home/user/odoo/openerp/http.py", line 1115, in load_addons

    m = __import__('openerp.addons.' + module)

  File "/home/user/odoo/openerp/modules/module.py", line 72, in load_module

    mod = imp.load_module('openerp.addons.' + module_part, f, path, descr)

  File "/home/user/odoo/openerp/addons/report/__init__.py", line 2, in <module>

    import models

  File "/home/user/odoo/openerp/addons/report/models/__init__.py", line 1, in <module>

    import report

  File "/home/user/odoo/openerp/addons/report/models/report.py", line 59, in <module>

    version = out.splitlines()[1].strip()

IndexError: list index out of range

how can I fix it ?