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Fail to create ROS Publisher and ROS subscriber

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Hi all,
I am creating subscriber and publishers for the turtle bot robot. For most topics, after using rosinit, I can create properly
publishers and subscribers. However, I fail to create a publisher for the /sound topic.
For instance, for topic cmd_vel I get:
r1 = Publisher with properties:
TopicName: '/cmd_vel'
IsLatching: 1
NumSubscribers: 0
MessageType: 'geometry_msgs/Twist'
It works perfect, but for topic sound I get:
Failed to create a publisher with topic name /sound and type turtlebot3_msgs/Sound.
Can anyone give me any hint about why this behaviour?
Thank you very much in advance,

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Cam Salzberger
Cam Salzberger 17 Jun 2019
Hello Ignacio,
The message type "geometry_msgs/Twist" is one of the standard, built-in ROS message types. However, the message type "turtlebot3_msgs/Sound" is a custom message type specific to the TurtleBot3. You'll need to make that message type available to MATLAB by building the "turtlebot3_msgs" package with the MATLAB Support Package for ROS Custom Messages.

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