Constant Script Error on Mailwasher Free Banner

[notnats]

For the last week each time I open Mailwasher Free version 6.5.4 I receive a script error box. The error says The value of the property 'urchinTracker, is null or undefined, not a Function
object.
Of course I get the standard question, do I want to continue running scripts on this page, yes or no. The program itself appears to run correctly but this is an annoyance. Why is this now happening? I have been using Mailwasher since almost the beginning so obviously I swear by the program. This wouldn't stop me from using it but is there a way to get rid of this script error?