[support] Weird error messages in http log

[Eric McKenna]

Has anyone seen this before?
[Thu Jan 10 11:47:29 2008] [error] [client xxx.xxx.xxx.xxx] ~``````` ,
referer: http://mysite.com/en/cases
[Thu Jan 10 11:47:29 2008] [error] [client xxx.xxx.xxx.xxx] ~``````` ,
referer: http://mysite.com/en/cases
[Thu Jan 10 11:47:29 2008] [error] [client xxx.xxx.xxx.xxx] ~``````` ,
referer: http://mysite.com/en/cases

I've tried grep'ing my files but I do not find anything.

Anyone?