Odoo configuration file: /etc/odoo11.conf

[options]
; This is the password that allows database operations:
; admin_passwd = admin
db_host = False
db_port = False
db_user = aristo-it-1
db_password = False
logfile = /var/log/odoo11/odoo-server.log
addons_path = /opt/odoo/odoo11/addons,/opt/odoo/odoo11/odoo/addons

Server Log:

2017-10-30 06:25:50,393 3939 CRITICAL ? odoo.modules.module: Couldn't load module web 2017-10-30 06:25:50,393 3939 CRITICAL ? odoo.modules.module: No module named 'web'
2017-10-30 06:25:50,393 3939 ERROR ? odoo.service.server: Failed to load server-wide module `web`.
The `web` module is provided by the addons found in the `openerp-web` project.
Maybe you forgot to add those addons in your addons_path configuration.
Traceback (most recent call last):
  File "/opt/odoo/odoo-11.0/odoo/service/server.py", line 869, in load_server_wide_modules
    odoo.modules.module.load_openerp_module(m)
  File "/opt/odoo/odoo-11.0/odoo/modules/module.py", line 368, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/opt/odoo/odoo-11.0/odoo/modules/module.py", line 61, in load_module
    f, path, (_suffix, _mode, type_) = imp.find_module(addon_name, ad_paths)
  File "/usr/lib/python3.5/imp.py", line 296, in find_module
    raise ImportError(_ERR_MSG.format(name), name=name)
ImportError: No module named 'web'
2017-10-30 06:25:50,418 3939 CRITICAL ? odoo.modules.module: Couldn't load module web_kanban 2017-10-30 06:25:50,418 3939 CRITICAL ? odoo.modules.module: No module named 'web_kanban'
2017-10-30 06:25:50,418 3939 ERROR ? odoo.service.server: Failed to load server-wide module `web_kanban`.
Traceback (most recent call last):
  File "/opt/odoo/odoo-11.0/odoo/service/server.py", line 869, in load_server_wide_modules
    odoo.modules.module.load_openerp_module(m)
  File "/opt/odoo/odoo-11.0/odoo/modules/module.py", line 368, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/opt/odoo/odoo-11.0/odoo/modules/module.py", line 61, in load_module
    f, path, (_suffix, _mode, type_) = imp.find_module(addon_name, ad_paths)
  File "/usr/lib/python3.5/imp.py", line 296, in find_module
    raise ImportError(_ERR_MSG.format(name), name=name)
ImportError: No module named 'web_kanban'