Hi, I'm trying to implement the composite message of string, image and numbers as follows. string name sensor_msgs/Image left_image sensor_msgs/Image right_image int32 size int32 maximum When I ran the rostopic to generate the my_msgs, there is an errors as the follows. $rostopic pub -r 1 /my_test test_msgs/my_msgs BlockMatch /BB2/left_rgb /BB2/right_rgb 11 256 ERROR: No key named [/BB2/left_rgb] Args are: [name left_image.header.seq left_image.header.stamp left_image.header.frame_id left_image.height left_image.width left_image.encoding left_image.is_bigendian left_image.step left_image.data right_image.header.seq right_image.header.stamp right_image.header.frame_id right_image.height right_image.width right_image.encoding right_image.is_bigendian right_image.step right_image.data size maximum] However, when I checked the rostopic list, /BB2/left_rgb and /BB2/right_rgb was publishing properly and it was double checked by image_view. The environment is boxturtle 1.0.5 on the Ubuntu 9.10 Any comment would be highly appreciated. Best, Soonhac