Simulink/ROS2 error when selecting message type:

2019 11 18
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When I try to publish or subscribe with a custom message type, I get the following error:
Error evaluating 'MaskDialog' callback of ROS2 Publish block (mask) 'untitled/Publish'. Callback string is 'ros.slros2.internal.block.PublishBlockMask.dispatch('messageTypeSelect', gcb, 'ros.slros2.internal.dlg.MessageTypeSelector');'
Expected input number 2, MessageList, to be nonempty.
Any help would be useful and greatly appreciated.

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R2019b

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