hello am newb here and need your help please..

I have read almost all forum in trying to find and answer to my problem and i couldn't.. any way am using SIM PAYMENT MODULE for authorize.net and i kind tend to have a problem

Error There has been an error processing your credit card. Please try again.


although am using my real credit card info still the credit card get processed on authorize.net but it shows me this message . i have checked my transaction key api and md hash and all were correct i have even installed the code that was recommended by DR ... whose an active user on this forum on this forum and nothing changed .. contact authorize.net and they said nothing can be done on their end and the problem from mys hopping cart ... plz help me . thanks a lot