Shipping IOC Won't resolve module nop 1.9

I've checked my namespaces, my class names etc and for the life of me can't use Type.GetType(srcm.ClassName) to resolve a class name for my module.. it always returns null..

any help would be awesome
Cheers,
Tom

Server Error in '/' Application.
Value cannot be null.
Parameter name: type
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: type

Source Error:

Line 918:                    continue;
Line 919:
Line 920:                var iShippingRateComputationMethod = Activator.CreateInstance(Type.GetType(srcm.ClassName)) as IShippingRateComputationMethod;
Line 921:
Line 922:                string errorSrcm = string.Empty;


Source File: C:\tomdev\PodPeople\PodPeople\Site\Libraries\Nop.BusinessLogic\Shipping\ShippingService.cs    Line: 920