unable to load msg: invalid name

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Hi,

Using Ubuntu 16.04, ROS Kinetic and Python, I've created a msg in ~/catkin_ws/src/roboti_pi/msg: Num.msg with content:

int32[] data

My code to use this message:

a = Num() a.data = [1, 2, 3]

This somehow gives an error for Num() so from ~/catkin_ws, I checked as shown at http://wiki.ros.org/ROS/Tutorials/Cre... with "rosmsg show src/roboti_pi/msg/Num and the result is

unable to load msg [src/roboti_pi/msg/Num]: invalid name [src/roboti_pi/msg/Num]

But what's invalid about it?

Thanks,

hvn