VAB - SourceTypeName

Question

Hello,
I am currently with the Validation Application Block (VAB) and I am having difficulty with the ValidationProvider. Everytime I run my test form to call the validation I have written in service, I get this error; "The source type does not represent a valid type for validation provider".

I am not setting my "SourceTypeName" correctly apparently, but I do not know what actually I should do to fix this. I tried changing my source specification to "Configuration", but I've had no luck. The reason I changed my specification source to this setting, is because my service actually calls a configuration file that house my rulesets and validators that I use to perform validation.

Could anyone point out what I am doing wrong? I merely followed step-by-step of what is available online as "labs" for the VAB; which includes adding the error provider and validation provider to my test form, but I still haven't had any success. Please help. Thanks!