Can not create linked values

Hi,
I followed the tutorial naming and linking

Error on creating Linked Values:

File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 871, in composer 16:36:05 web.1 | return composed(self, method, *args, **kwargs) 16:36:05 web.1 | File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 854, in runner 16:36:05 web.1 | add_to_return_value(self, fn(self, *args, **kwargs)) 16:36:05 web.1 | File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 649, in <lambda> 16:36:05 web.1 | fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs) 16:36:05 web.1 | File "/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py", line 62, in validate 16:36:05 web.1 | self.update_fields_to_fetch() 16:36:05 web.1 | File "/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py", line 100, in update_fields_to_fetch 16:36:05 web.1 | link_fieldname = link_fieldname 16:36:05 web.1 | File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 148, in sql 16:36:05 web.1 | self._cursor.execute(query) 16:36:05 web.1 | File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/cursors.py", line 205, in execute 16:36:05 web.1 | self.errorhandler(self, exc, value) 16:36:05 web.1 | File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler 16:36:05 web.1 | raise errorclass, errorvalue 16:36:05 web.1 | OperationalError: (1054, "Unknown column 'target.article_name' in 'field list'")

Will appreciate if anyone can help

solved.

use command : bench update