Java Exception with default messages path about red5phone HOT 4 OPEN

how to resolve

Well if I change it to an absolute path it works:

log_path=/Home/dev/red5/webapps/sip/logs

Thanks for your reply,

My problem is red5phone never write any message in logs folder. The rtmp 
connection
is succeed, but when press on Register, nothing happend. I tried to replace the
red5.jar with the new red5.jar. but red5 server dose not work after 
replacement. I
wonder where can I find the the log files?

communication between red5 and asterisk


15:04:22.421 Fri 10 Oct 2008, 192.168.1.11:5060/udp (437 bytes): SIP/2.0 100 
Trying, 
received

SipProvider-5073: received new SIP message
SipProvider-5073: no listener found: meesage discarded.
SipProvider-5073: transport udp:null:5073 terminated
TransactionClient#12: Retransmission timeout expired
SipProvider-5073: using transport udp
SipProvider-5073: Resolving host address '192.168.1.11'
SipProvider-5073: Sending message to udp:192.168.1.11:5060
Exception: java.lang.NullPointerException
    at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:682)
    at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:663)
    at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:814)
    at org.zoolu.sip.transaction.TransactionClient.onTimeout
(TransactionClient.java:127)
    at org.zoolu.tools.Timer.onInnerTimeout(Timer.java:126)
    at org.zoolu.tools.InnerTimer.run(InnerTimer.java:43)

Exception: java.lang.NullPointerException
    at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:682)
    at org.zoolu.sip.provider.SipProvider.sendMessage(SipProvider.java:663)
    at local.net.KeepAliveSip.sendToken(KeepAliveSip.java:81)
    at local.net.KeepAliveUdp.run(KeepAliveUdp.java:156)
    at local.net.KeepAliveSip.run(KeepAliveSip.java:88)