SafeWeb marks our site with a threat that doesn't exist

Our website has once again been marked with a threat:

Threat Report

SWBPL  Threats found: 1  

Here is a complete list: (for more information about a specific threat, click on the Threat Name below)

Threat Name:SWBPL

Location:http://thegoldfishclub.co.uk/~hhldbixl

 

This threat does not exist and never has.  This same threat was "found" before and when I questioned it Norton marked it (correctly) as SAFE.  Now it has reappeared - why the hell does this keep happening ?

We are a non-profit organisation with a large number of elderly members and this fake "threat" is scaring them away.

How can I get our site marked as SAFE again and how can we prevent this from happening again ?

I have registered with Norton and performed all the site verification tasks ... GRRRRR !