Ok I see the problem.
We will fix the problem in the next version of eLitius.
Actually this is not a problem it's just wrong name for the variable you use when select the banner image.
We will change that name in the next version.
But if you want us to do it for you please let us know we will change it in your version or give you the instructions how to do it by yourself.
Don't worry the url by itself (from affiliate panel) works fine we checked it!
eLitius - Affordable Affiliate Management and Tracking Software
Subrion - Open Source Content Management System