I have been getting thsi error message in my google callback error page ........

Your server returned no data in its response; Checkout requires data of type merchant-calculation-results in response to merchant-calculation-callback



what google sends to me is --------------

<?xml version="1.0" encoding="UTF-8"?>
<merchant-calculation-callback xmlns="http://checkout.google.com/schema/2" serial-number="16439351-4dd7-4453-828b-c655a76e1f0d">
<shopping-cart>
<merchant-private-data>


<session-data>4869fb81b0ddd4fcc902e497e4764d0;zenid</session-data>


<product-data>;147</product-data>


<ip-address>68.zzz.yyy.xxx</ip-address>


</merchant-private-data>
<items>
<item>
<quantity>1</quantity>
<unit-price currency="USD">299.95</unit-price>
<item-name>20619 - 7pc Classic Set w/free 8&amp;quot; frypan &amp;amp; free Stack &amp;amp; Steam</item-name>
<item-description></item-description>
<tax-table-selector></tax-table-selector>
</item>
</items>
</shopping-cart>
<buyer-id>12234563</buyer-id>
<calculate>
<addresses>
<anonymous-address id="1112234549972">
<country-code>US</country-code>
<city>Carmel</city>
<region>IN</region>
<postal-code>46033</postal-code>
</anonymous-address>
</addresses>
<merchant-code-strings />
<tax>false</tax>
<shipping>
<method name="Table: Table Rate (vary by weight/price)" />
<method name="UPS: Next Day Air Early AM" />
<method name="UPS: Next Day Air Early AM Letter" />
<method name="UPS: Worldwide Expedited" />
</shipping>
</calculate>
<buyer-language>en_US</buyer-language>
</merchant-calculation-callback>

=======================
I see that this arrives in response_message.log but seems that respondhandler is not responding to it ......

does anyone else see this ..... any clues are helpful ..... thanks