When I try to open my quotations in form view I get an error message and quotations do not open anymore. Can anyone help? Error message is:

Client Traceback (most recent call last): File "/var/packages/OpenERP7.x/target/openerp/addons/web/http.py", line 195, in dispatch response["result"] = method(self, **self.params) File "/var/packages/OpenERP7.x/target/openerp/addons/web/controllers/main.py", line 1079, in call_kw return self._call_kw(req, model, method, args, kwargs) File "/var/packages/OpenERP7.x/target/openerp/addons/web/controllers/main.py", line 1065, in _call_kw records = req.session.model(model).read(*args, **kwargs) File "/var/packages/OpenERP7.x/target/openerp/addons/web/session.py", line 43, in proxy result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw) File "/var/packages/OpenERP7.x/target/openerp/addons/web/session.py", line 31, in proxy_method result = self.session.send(self.service_name, method, *args) File "/var/packages/OpenERP7.x/target/openerp/addons/web/session.py", line 104, in send raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info) Server Traceback (most recent call last): File "/var/packages/OpenERP7.x/target/openerp/addons/web/session.py", line 90, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/usr/local/lib/python2.7/site-packages/openerp/netsvc.py", line 295, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/usr/local/lib/python2.7/site-packages/openerp/service/web_services.py", line 614, in dispatch res = fn(db, uid, *params) File "/usr/local/lib/python2.7/site-packages/openerp/osv/osv.py", line 188, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/usr/local/lib/python2.7/site-packages/openerp/osv/osv.py", line 131, in wrapper return f(self, dbname, *args, **kwargs) File "/usr/local/lib/python2.7/site-packages/openerp/osv/osv.py", line 198, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/usr/local/lib/python2.7/site-packages/openerp/osv/osv.py", line 185, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/usr/local/lib/python2.7/site-packages/openerp/osv/orm.py", line 3604, in read result = self._read_flat(cr, user, select, fields, context, load) File "/usr/local/lib/python2.7/site-packages/openerp/osv/orm.py", line 3724, in _read_flat res2 = self._columns[f].get(cr, self, ids, f, user, context=context, values=res) File "/usr/local/lib/python2.7/site-packages/openerp/osv/fields.py", line 1131, in get result = self._fnct(obj, cr, uid, ids, name, self._arg, context) File "/usr/local/lib/python2.7/site-packages/openerp/osv/fields.py", line 1197, in _fnct_read value = value[field] or False File "/usr/local/lib/python2.7/site-packages/openerp/osv/orm.py", line 399, in __getitem__ field_values = self._table.read(self._cr, self._uid, ids, field_names, context=self._context, load="_classic_write") File "/usr/local/lib/python2.7/site-packages/openerp/osv/orm.py", line 3604, in read result = self._read_flat(cr, user, select, fields, context, load) File "/usr/local/lib/python2.7/site-packages/openerp/osv/orm.py", line 3656, in _read_flat cr.execute(query, [tuple(sub_ids)] + rule_params) File "/usr/local/lib/python2.7/site-packages/openerp/sql_db.py", line 162, in wrapper return f(self, *args, **kwargs) File "/usr/local/lib/python2.7/site-packages/openerp/sql_db.py", line 227, in execute res = self._obj.execute(query, params) ProgrammingError: column sale_order.picking_policy does not exist LINE 1: ...second', sale_order."create_date") as create_date,sale_order...