Warning message UPS Shipping notice: The ship to zipcode is blank.

[dezinezone]

Joomla 2.5.17
Virtuemart 2.0.26d
Joomla template T3 Blank version 2.0.1
Reviver - Responsive Multipurpose VirtueMart Theme

When I have products in my cart and I am not logged in I get the warning message "UPS Shipping notice: The ship to zip code is blank." When I sign in it does not go away.

When I add a product to the cart and I AM ALREADY SIGNED IN to the site I do not get this message.
Is there a way to fix this?
Thank you

[alatak]

Hello
The best is to contact directly the developer of this plugin.

[dezinezone]

Thank you for your response