XML error in script

Hi,

I got this error in my xcart website.

Error:

Error parsing XML; message from parser is: Invalid value for body of quantity in checkout-shopping-cart/shopping-cart/items/item: Must be at least 1

Warnings: XML failed to validate against the schema at line: 8, column: 8, with error: cvc-datatype-valid.1.2.1: '' is not a valid value for 'decimal'.
XML failed to validate against the schema at line: 8, column: 8, with error: cvc-complex-type.2.2: Element 'unit-price' must have no element [children], and the value must be valid.
XML failed to validate against the schema at line: 9, column: 9, with error: cvc-minInclusive-valid: Value '0' is not facet-valid with respect to minInclusive '1' for type '#AnonType_quantityItem'.
XML failed to validate against the schema at line: 9, column: 9, with error: cvc-type.3.1.3: The value '0' of element 'quantity' is not valid.

<checkout-shopping-cart xmlns="http://checkout.google.com/schema/2">
  <shopping-cart>
    <items>
      <item>
        <item-name>Postcards</item-name>
        <item-description>Standard (5.47&amp;quot; x 4.21&amp;quot;), Double-Sided, Full Color - Price Breakdown (Excluding Envelopes)</item-description>
        <unit-price currency="USD"></unit-price>
        <quantity>0</quantity>
        <merchant-item-id>620</merchant-item-id>
      </item>
    </items>
  </shopping-cart>
  <checkout-flow-support>
    <merchant-checkout-flow-support>
      <edit-cart-url>http://www.savethedatemagic.com?sol=cart</edit-cart-url>
      <continue-shopping-url>http://www.savethedatemagic.com</continue-shopping-url>
      <shipping-methods>
        <flat-rate-shipping name="Rush ('3 Business Days')">
          <price currency="USD">29.99</price>
          <shipping-restrictions>
            <allow-us-po-box>true</allow-us-po-box>
            <allowed-areas>
              <us-country-area country-area="CONTINENTAL_48" />
            </allowed-areas>
          </shipping-restrictions>
        </flat-rate-shipping>
        <flat-rate-shipping name="Priority ('7 Days')">
          <price currency="USD">12.99</price>
          <shipping-restrictions>
            <allow-us-po-box>true</allow-us-po-box>
            <allowed-areas>
              <us-country-area country-area="CONTINENTAL_48" />
            </allowed-areas>
          </shipping-restrictions>
        </flat-rate-shipping>
      </shipping-methods>
      <request-buyer-phone-number>false</request-buyer-phone-number>
      <tax-tables>
        <default-tax-table>
          <tax-rules>
            <default-tax-rule>
              <shipping-taxed>false</shipping-taxed>
              <rate>0.075</rate>
              <tax-area>
                <us-state-area>
                  <state>FL</state>
                </us-state-area>
              </tax-area>
            </default-tax-rule>
          </tax-rules>
        </default-tax-table>
      </tax-tables>
    </merchant-checkout-flow-support>
  </checkout-flow-support>
</checkout-shopping-cart>

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