Problem with Label will not go to check out.

There is no problem with any of the labels addresses yet it says there is. I erased it all and put one label in and tried to check out cannot. Says this:

• You have a non-deliverable Delivery Address label in your Shipping Cart. Please use the Edit Label Information link to change the Delivery Address. Additional assistance is available at Find ZIP Codes. 

This is not true. They have a problem with their site again!!!!!