[squid-users] Rproxy error?

I use squid as a rproxy server,.

I now get a lot of errors in cache.log

Can someone explain how to prevent them:

2003/02/14 05:10:56| WARNING: Forwarding loop detected for:
GET /images/website/home/beeld_kantoorartikelen.jpg HTTP/1.0
If-Modified-Since: Wed, 16 Oct 2002 13:57:00 GMT
User-Agent: iPlanet-Web-Proxy-Server/3.6 (Batch update)
Accept: */*
Pragma: no-cache
Forwarded: by http://nlprx01.:8080 (iPlanet-Web-Proxy-Server/3.6)
Via: 1.0 www.ahrend.com:80 (Squid/2.4.STABLE7)
X-Forwarded-For: 195.75.83.239
Host: 194.134.69.88
Cache-Control: max-age=259200
Connection: keep-alive
Received on Sat Feb 15 2003 - 03:10:42 MST