I am using ROS Subscribe block in simulink to access ROS messages from a Vicon system. I have created custom ROS messages for the Vicon markers and I can view the X,Y,Z positions online via: rostopic echo /vicon/markers. However, when I try to use a display block in Simulink to display the X,Y,Z positions, I get the error shown in the second snapshot shown below. The error suggests that I need to use a Signal Selector before using a Bus Selector. However, I am not sure what the signal indexing format is. Could you please provide some guidance? Thank you.