I got the following error when I tried to create a new product through the sales order.

Client Traceback (most recent call last): File "/opt/openerp/server/openerp/addons/web/http.py", line 204, in dispatch response["result"] = method(self, **self.params) File "/opt/openerp/server/openerp/addons/web/controllers/main.py", line 1125, in call_kw return self._call_kw(req, model, method, args, kwargs) File "/opt/openerp/server/openerp/addons/web/controllers/main.py", line 1111, in _call_kw records = req.session.model(model).read(*args, **kwargs) File "/opt/openerp/server/openerp/addons/web/session.py", line 42, in proxy result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw) File "/opt/openerp/server/openerp/addons/web/session.py", line 30, in proxy_method result = self.session.send(self.service_name, method, *args) File "/opt/openerp/server/openerp/addons/web/session.py", line 103, in send raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info) Server Traceback (most recent call last): File "/opt/openerp/server/openerp/addons/web/session.py", line 89, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/opt/openerp/server/openerp/netsvc.py", line 292, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/opt/openerp/server/openerp/service/web_services.py", line 626, in dispatch res = fn(db, uid, *params) File "/opt/openerp/server/openerp/osv/osv.py", line 190, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/opt/openerp/server/openerp/osv/osv.py", line 132, in wrapper return f(self, dbname, *args, **kwargs) File "/opt/openerp/server/openerp/osv/osv.py", line 199, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/opt/openerp/server/openerp/osv/osv.py", line 187, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/opt/openerp/server/openerp/osv/orm.py", line 3625, in read result = self._read_flat(cr, user, select, fields, context, load) File "/opt/openerp/server/openerp/osv/orm.py", line 3734, in _read_flat res2 = self._columns[val[0]].get(cr, self, ids, val, user, context=context, values=res) File "/opt/openerp/server/openerp/osv/fields.py", line 1142, in get result = self._fnct(obj, cr, uid, ids, name, self._arg, context) File "/opt/openerp/server/openerp/addons/stock/product.py", line 358, in _product_available stock = self.get_product_available(cr, uid, ids, context=c) File "/opt/openerp/server/openerp/addons/stock/product.py", line 219, in get_product_available warehouse_id = shop_obj.read(cr, uid, int(context['shop']), ['warehouse_id'])['warehouse_id'][0] KeyError: 'warehouse_id'

But I am not able to trace the reason for this error .The database is the one from which I had erased all the data and is going to put all data fresh.What are the possible reasons for this particular error?