Exception when using MessageBroker AB

I’m getting this exception in the EventBrokerService.cs (Application Block)

Genesyslab.Platform.Commons.Protocols.ProtocolException was unhandled by user code
Message=“External receiver is set, use its methods instead
Source=“Genesyslab.Platform.Commons.Protocols”
StackTrace:
at Genesyslab.Platform.Commons.Protocols.DuplexChannel.get_InternalReceiver()
at Genesyslab.Platform.Commons.Protocols.DuplexChannel.Receive(TimeSpan tsTimeout)
at Genesyslab.Platform.Commons.Protocols.DuplexChannel.Receive()
at Genesyslab.Platform.ApplicationBlocks.Commons.Broker.EventBrokerService.Receive() in D:*\EventBrokerService.cs:line 174
at Genesyslab.Platform.ApplicationBlocks.Commons.Broker.MessageBrokerService`1.Process(Object state) in D:*
\MessageBrokerService.cs:line 273
at Genesyslab.Platform.Commons.Threading.SingleThreadInvoker.ProcessEvents()