I just purchased the Payment Registration Pro module and installed it. I added a product. When I enter the user information and click "Next", I get the following error:

AssemblyVersion: 5.6.1
PortalID: 34
PortalName: Timeshare University - Where timeshare professionals LEARN to EARN!
UserID: 5
UserName: brian
ActiveTabID: 2679
ActiveTabName: Subcriptions
RawURL: /PRODUCTS/Subcriptions/tabid/2679/language/en-US/Default.aspx?ctlname=Step2
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.timeshareu.com/PRODUCTS/Subcriptions/tabid/2679/language/en-US/Default.aspx
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 5901e126-e608-49f0-bcd9-62ab06eaf55b
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: Smith.DNN.Modules.Registration.Step2.BindddlPaymentMethod
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Smith.DNN.Modules.Registration.Step2.BindddlPaymentMethod() at Smith.DNN.Modules.Registration.Step2.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---