Ok, figured out why I was getting this error and it looks like a bug.
If you do a Send Invatation with a Validity period of Endless then
Timezone is disabled. If you select Period and select a Timezone then
it works!
> org.openmeetings.app.remote.InvitationService.sendInvitationHash(InvitationService.java:
> 91) [openmeetings.jar:na]
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:
> 1.6.0_22]
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
> 39) [na:1.6.0_22]
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
> 25) [na:1.6.0_22]
> at java.lang.reflect.Method.invoke(Method.java:597) [na:1.6.0_22]
> at org.red5.server.service.ServiceInvoker.invoke(ServiceInvoker.java:
> 200) [red5.jar:na]
> at org.red5.server.service.ServiceInvoker.invoke(ServiceInvoker.java:
> 118) [red5.jar:na]
> at org.red5.server.net.rtmp.RTMPHandler.invokeCall(RTMPHandler.java:
> 164) [red5.jar:na]
> at org.red5.server.net.rtmp.RTMPHandler.onInvoke(RTMPHandler.java:
> 416) [red5.jar:na]
> at
> org.red5.server.net.rtmp.BaseRTMPHandler.messageReceived(BaseRTMPHandler.java:
> 138) [red5.jar:na]
> at
> org.red5.server.net.rtmp.RTMPMinaIoHandler.messageReceived(RTMPMinaIoHandler.java:
> 180) [red5.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain
> $TailFilter.messageReceived(DefaultIoFilterChain.java:713) [mina-
> core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:
> 434) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain.access
> $1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl
> $1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at
> org.red5.server.net.filter.TrafficShapingFilter.messageReceived(TrafficShapingFilter.java:
> 204) [red5.jar:na]
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:
> 434) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain.access
> $1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl
> $1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at org.apache.mina.filter.codec.ProtocolCodecFilter
> $ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:383) [mina-
> core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:
> 229) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:
> 434) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain.access
> $1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl
> $1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC2-
> SNAPSHOT.jar:na]
> at
> org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:
> 119) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:
> 434) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:
> 426) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:
> 708) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:
> 665) [mina-core-2.0.0-RC2-SNAPSHOT.jar:na]
> at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java: