A difficult wordpress problem

i have two sites in my server. all the settings and plugins are the same. but one of them keeps giving a lot of errors. i see hundreds of error like those in ERROR_LOG file ;

[08-Apr-2012 14:30:35] PHP Warning: parse_url(://rpc.aitellu.com) [function.parse-url]: Unable to parse URL in /home/gurtuna/public_html/wp-includes/class-http.php on line 120
[08-Apr-2012 14:30:35] PHP Warning: parse_url(://rpc.bloggerei.de/ping/) [function.parse-url]: Unable to parse URL in /home/gurtuna/public_html/wp-includes/class-http.php on line 120
[08-Apr-2012 14:30:35] PHP Warning: parse_url(://rpc.bloggerei.de/ping/) [function.parse-url]: Unable to parse URL in /home/gurtuna/public_html/wp-includes/class-http.php on line 120
[08-Apr-2012 14:30:35] PHP Warning: parse_url(://rpc.pingomatic.com) [function.parse-url]: Unable to parse URL in /home/gurtuna/public_html/wp-includes/class-http.php on line 120
[08-Apr-2012 14:30:35] PHP Warning: parse_url(://rpc.pingomatic.com) [function.parse-url]: Unable to parse URL in /home/gurtuna/public_html/wp-includes/class-http.php on line 120

Ping services is like this;
api.my.yahoo.co.jp/RPC2
audiorpc.weblogs.com/RPC2
blog.goo.ne.jp/XMLRPC
blog.with2.net/ping.php
bloglines.com/ping
blogpeople.net/ping
blogpeople.net/servlet/weblogUpdates
blogpingr.de/ping/rpc2
blogsearch.google.ae/ping/RPC2
blogsearch.google.at/ping/RPC2
blogsearch.google.be/ping/RPC2
blogsearch.google.bg/ping/RPC2
blogsearch.google.ca/ping/RPC2
blogsearch.google.ch/ping/RPC2
blogsearch.google.cl/ping/RPC2
blogsearch.google.co.cr/ping/RPC2
blogsearch.google.co.hu/ping/RPC2
blogsearch.google.co.id/ping/RPC2
blogsearch.google.co.il/ping/RPC2
blogsearch.google.co.in/ping/RPC2
blogsearch.google.co.jp/ping/RPC2
blogsearch.google.co.ma/ping/RPC2
blogsearch.google.co.nz/ping/RPC2
blogsearch.google.co.th/ping/RPC2
blogsearch.google.co.uk/ping/RPC2
blogsearch.google.co.ve/ping/RPC2
blogsearch.google.co.za/ping/RPC2
blogsearch.google.com.ar/ping/RPC2
blogsearch.google.com.au/ping/RPC2
blogsearch.google.com.br/ping/RPC2
blogsearch.google.com.co/ping/RPC2
blogsearch.google.com.do/ping/RPC2
blogsearch.google.com.mx/ping/RPC2
blogsearch.google.com.my/ping/RPC2
blogsearch.google.com.pe/ping/RPC2
blogsearch.google.com.sa/ping/RPC2
blogsearch.google.com.sg/ping/RPC2
blogsearch.google.com.tr/ping/RPC2
blogsearch.google.com.tw/ping/RPC2
blogsearch.google.com.ua/ping/RPC2
blogsearch.google.com.uy/ping/RPC2
blogsearch.google.com.vn/ping/RPC2
blogsearch.google.com/ping/RPC2
blogsearch.google.de/ping/RPC2
blogsearch.google.es/ping/RPC2
blogsearch.google.fi/ping/RPC2
blogsearch.google.fr/ping/RPC2
blogsearch.google.gr/ping/RPC2
blogsearch.google.hr/ping/RPC2
blogsearch.google.ie/ping/RPC2
blogsearch.google.it/ping/RPC2
blogsearch.google.jp/ping/RPC2
blogsearch.google.lt/ping/RPC2
blogsearch.google.nl/ping/RPC2
blogsearch.google.pl/ping/RPC2
blogsearch.google.pt/ping/RPC2
blogsearch.google.ro/ping/RPC2
blogsearch.google.ru/ping/RPC2
blogsearch.google.se/ping/RPC2
blogsearch.google.sk/ping/RPC2
blogsearch.google.us/ping/RPC2
i-learn.jp/ping/
ping.blo.gs
ping.blogs.yandex.ru/RPC2
ping.feedburner.com
ping.kutsulog.net/
ping.myblog.jp
ping.pubsub.com/ping
ping.syndic8.com/xmlrpc.php
ping.wordblog.de/
pingoo.jp/ping/
rpc.aitellu.com
rpc.bloggerei.de/ping/
rpc.pingomatic.com
rpc.reader.livedoor.com/ping
rpc.twingly.com
rpc.weblogs.com/RPC2
services.newsgator.com/ngws/xmlrpcping.aspx
http://www.syndic8.com/xmlrpc.php
http://www.wasalive.com/ping/
http://www.zhuaxia.com/rpc/server.php
xping.pubsub.com/ping/
zhuaxia.com/rpc/server.php

Can anyone help me to solve this problem. Thanks…

I thought those were from failed pings. Do both use the same ping list, fine in one but not the other?

On further reflection, AFAIK ping fails involve the class-IXR.php file and parse_url is in class-simplepie.php, hmmmm.

In any case, do both blogs use the same list?

yes, they use the same list