Traceback (most recent call last):
  File "/usr/local/bin/trytond-admin", line 5, in <module>
    pkg_resources.run_script('trytond==3.9.dev0', 'trytond-admin')
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 528, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1394, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/local/lib/python2.7/dist-packages/trytond-3.9.dev0-py2.7.egg/EGG-INFO/scripts/trytond-admin", line 21, in <module>
    admin.run(options)
  File "/usr/local/lib/python2.7/dist-packages/trytond-3.9.dev0-py2.7.egg/trytond/admin.py", line 19, in run
    Database = backend.get('Database')
  File "/usr/local/lib/python2.7/dist-packages/trytond-3.9.dev0-py2.7.egg/trytond/backend/__init__.py", line 30, in get
    ep, = pkg_resources.iter_entry_points('trytond.backend', db_type)
ValueError: need more than 0 values to unpack