After upgrading to virtuemart 2.0 on a joomla 1.5 shipping module is not working

[jothirajan]

After upgrading to virtuemart 2.0 on a joomla 1.5 install i am  having problems with Shipment Method

i came to the shipment page index.php?option=com_virtuemart&view=cart&task=edit_shipment

Please select a shipment method

USPS First-Class Package International Service™** (Varies by destination) ($6.55)
USPS Priority Mail International® (6 - 10 business days) ($39.25)


eventhough i select anything it reloads and nothing happens, any help please



Notice error:

Notice: Trying to get property of non-object in /************/plugins/vmshipment/alatak_usps.php on line 189 Notice: Trying to get property of non-object in  /************/plugins/vmshipment/alatak_usps.php on line 189