I am getting error while clicking on product menu, and on the kanban view,

File "/opt/openerp/server/openerp/addons/stock/product.py", line 36, in _stock_move_count ], ['product_id'], ['product_id']) File "/opt/openerp/server/openerp/osv/orm.py", line 2717, in read_group cr.execute('SELECT min(%s.id) AS id, count(%s.id) AS %s_count' % (self._table, self._table, group_count) + (flist and ',') + flist + ' FROM ' + from_clause + where_clause + gb + (ob and ',') + ob + orderby_clause + limit_str + offset_str, where_clause_params) File "/opt/openerp/server/openerp/sql_db.py", line 161, in wrapper return f(self, args, *kwargs) File "/opt/openerp/server/openerp/sql_db.py", line 226, in execute res = self._obj.execute(query, params) ProgrammingError: column "stock_move__product_id.name_template" must appear in the GROUP BY clause or be used in an aggregate function

Any Idea why this is occurred?

can anyone help me on this.