Hi
I am using the Zone Rates shipping module which is set up by weight

Zone rate: True
Calculation Basis: Weight
Tax Class : None
Tax Basis: Shipping
Zone 1: GB

1:2.95,1.25:4.95,1.5:5.95,1.75:6.95,2:7.95,2.25:8.95,2.5:9.95

Zone 2: Different Rates
Zone 3: Different Rates

However I get the following error message:

Zone Rates (The shipping rate cannot be determined at this time):

I'm using Zen 1.3.7

The url is http://www.kentishtrader.co.uk/catalog

Any help would be much appreciated