I am trying to implement shipping charge by weight and state/province in NOP1.6. I have setup the code identical to the shipping by weight and country so far. The admin pages work fine for setting up the different rates. etc. However when checking out I get the following error message:
'Value cannot be null. Parameter name='type'
Here is the line in the file 'ShippingManger.cs' that is causing this error. For the life of me I can't figure out why I'm getting this. Any help is greatly appreciated.
var iShippingRateComputationMethod = Activator.CreateInstance(Type.GetType(srcm.ClassName)) as IShippingRateComputationMethod; //line 143 in BusinessLogic/shipping/shippingmanager.cs
Bazman