Swimlanes: error publishing: there already is a message event subscription for the message with name 'messageTest'

Hi,
For better readability of my process, I started moving an existing process to swimlanes.

When publishing, I see that it gives an error:

org.flowable.engine.common.api.FlowableException: Cannot deploy process definition 'lanes_test.bpmn': there already is a message event subscription for the message with name 'messageTest'.

Test app can be downloaded here:

Anyone has an idea?

Regards,
Wim

I have the same error. did you found a solution to your problem?