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javax.naming.NameNotFoundException

From: HANDE CANORUÇ <handecanoruc_at_gmail.com>
Date: Tue, 24 Aug 2010 14:02:05 +0300

WARNING| _ThreadID=35;_ThreadName=Thread-1;|javax.naming.NamingException:
Lookup failed for 'java:comp/env/cas/proxyReceptorUrl' in SerialContext
[Root exception is javax.naming.NameNotFoundException: No object bound to
name java:comp/env/cas/proxyReceptorUrl]

I am using Jasig CAS which is an open source authentication system and
glassfish v3. In the server.log I am getting this warning. Why am I getting
this warning ?
 Any Ideas?