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The problem stemmed from my .msg file beginning with a lower case letter. Change it to a capital and everything worked. I've searched and can't find where the file name for a .msg file must begin with a capital. This did not seem to be a requirement in ROS1 although a lot of examples did it.

In any event, it would be nice if this was made clearer and the response to a lower case beginning letter wasn't the message generator python program crashing and a simple error message indicating the generated.

The problem stemmed from my .msg file beginning with a lower case letter. Change it to a capital and everything worked. I've searched and can't find where the file name for a .msg file must begin with a capital. This did not seem to be a requirement in ROS1 although a lot of examples did it.

In any event, it would be nice if this was made clearer and the response to a lower case beginning letter wasn't the message generator python program crashing and a simple error message indicating the generated.that was generated instead.