Error executing call

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Hi,

I get the following error when joining a room:
[ERROR] [RTMPExecutor#PFDXOTMYOP58F-1] 
org.red5.server.service.ServiceInvoker - Error executing call: Service: 
null Method: play Num Params: 2 0: null 1: NaN
java.lang.IllegalArgumentException: argument type mismatch
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[na:1.7.0_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
~[na:1.7.0_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown 
Source) ~[na:1.7.0_67]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_67]
        at 
org.red5.server.service.ServiceInvoker.invoke(ServiceInvoker.java:193) 
~[red5-server.jar:na]
        at 
org.red5.server.net.rtmp.RTMPHandler.invokeCall(RTMPHandler.java:210) 
[red5-server.jar:na]
        at 
org.red5.server.net.rtmp.RTMPHandler.onCommand(RTMPHandler.java:269) 
[red5-server.jar:na]
        at 
org.red5.server.net.rtmp.BaseRTMPHandler.messageReceived(BaseRTMPHandler.java:89) 
[red5-server.jar:na]
        at 
org.red5.server.net.rtmp.ReceivedMessageTask.call(ReceivedMessageTask.java:55) 
[red5-server.jar:na]
        at 
org.red5.server.net.rtmp.ReceivedMessageTask.call(ReceivedMessageTask.java:11) 
[red5-server.jar:na]
        at java.util.concurrent.FutureTask.run(Unknown Source) 
[na:1.7.0_67]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown 
Source) [na:1.7.0_67]
        at java.util.concurrent.FutureTask.run(Unknown Source) 
[na:1.7.0_67]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source) [na:1.7.0_67]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source) [na:1.7.0_67]
        at java.lang.Thread.run(Unknown Source) [na:1.7.0_67]
[WARN] [RTMPExecutor#PFDXOTMYOP58F-1] org.red5.server.net.rtmp.Channel - 
Non-existant stream for channel id: 14, connection id: PFDXOTMYOP58F 
discarding: {}

I don't know how to fix it.

OpenMeetings 3.0.3
Java JRE 1.7.0.67
Gentoo Linux, Kernel 3.16.2

Can you help? Thnx