I've just started getting this error in the last hour or so, does anyone know why it might have started?

[Tue Mar 5 01:41:56 2002] [error] [client 213.106.15.150] (12)Cannot allocate memory: getgrgid: invalid groupid 2522
[Tue Mar 5 01:41:56 2002] [error] (12)Cannot allocate memory: exec of ..../cgi-bin/chat/chat.cgi failed
[Tue Mar 5 01:41:56 2002] [error] [client 213.106.15.150] Premature end of script headers: ..../cgi-bin/chat/chat.cgi