Sagepay Form .... I Need Help !!!

I am trying to setup the Sagepay Form intergration into my website.

I have everything from Sagepay IE: Vendor Name, encryption password etc.

When I got to do a test transaction i get an error page from sagepay:


Form Transaction error

Can anyone help me? I dont know what is going wrong… I have spoken to Sagepay and the tech guy say that its not sage but a problem with the “failure url or success url”

Help please :cry: