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I've created my own message type, and have a C++ program generating messages. When I attempt to listen to the messages using rostopic echo, I get the following message.
ERROR: Cannot load message class for [mocap_msgs/LocalMocapFrame]. Are your messages built?
My messages are built and compiled. Why do I still get this error message?
Are you sure that rostopic is running with the same ROS_PACKAGE_PATH and that the messages are built correctly? A quick test:
#!/usr/bin/env python
import roslib
roslib.load_manifest('mocap_msgs')
import mocap_msgs.msg
print mocap_msgs.msg.LocalMocapFrame
If you need to listen for the custom messages, you need to source devel/setup.bash first:
source devel/setup.bash
rostopic echo /generate_tool_paths/result
If you just source something like /opt/ros/noetic/setup.bash, this is enough for the simple built-in messages to work but not for others.
Asked: 2011-08-14 09:10:08 -0600
Seen: 2,006 times
Last updated: Jun 11 '21
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