Log file message

I'm getting a lot of message like this in my cache.log file. Does
anybody know what it means?

97/05/02 18:09:05| ERR_NO_CLIENTS_BIG_OBJ: http://www.pro-wrestling.com/women/ma
rlena/pic31.jpg

Oh yeah, it's not only that site, I usually get a message like this every
couple of seconds from a wide and varied mix of sites.

Cheers.
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Received on Fri May 02 1997 - 01:22:45 MDT