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ROS2-Eloquent-Binary demo run error:"Failed to load entry point **" on Mac (10.14) Hello everyone, I met a problem when

ROS2-Eloquent-Binary: "Failed to launch entry point" on Mac (10.14) Hello everyone, I met a problem when I followed the

thank you, I installed it.

hello professors, when I successfully run the package and there is no error showing on the terminal, but the rviz shows nothing and there is no model at all...So I'm so confused about this problem and I can't find where the problem is... Thanks for your information.

Hello professors, I am so confused about the tutorial of catkin which told us that we should type the command: source /opt/ros/groovy/setup.bash every time.... I have no idea. because before I type this command, my workspace is under home directory which is /home/username/workspace, but when I type this command and then I type the 'roscd', the path turned to /opt/ros/groovy/.. so my question is where should I create my package? Does that mean every time when I want to create package I should source first? I' so confused about this.. cause when I try to create package and run it, there always be showing some error which told me that command not found....I just follow the tutorials....

Thanks so much for your instruction.

Just like the topic I posed, when I try to use roslaunch command to run in the terminal, I met this problem (as followed):

Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/groovy/stacks/xacro/xacro.py '/home/viki/ros_workspace/smartcar_description/urdf/smartcar.urdf.xacro'] returned with code [1]. 

Param xml is <param command="$(arg urdf_file)" name="robot_description"/>

I have no idea how to solve this problem, I sincerely you could give the instructions about how to solve this problem.

Thanks so much for your time.

when I run the code rosrun xacro xacro.py /home/viki/ros_workspace/smartcar_description/urdf/smartcar.urdf.xacro to check the xacro, there is the information showed as followed:

Expat parsing error.  Check that:
 - Your XML is correctly formed
 - You have the xacro xmlns declaration: xmlns:xacro="http://www.ros.org/wiki/xacro"

Traceback (most recent call last):
  File "/opt/ros/groovy/stacks/xacro/xacro.py", line 35, in <module>
    xacro.main()
  File "/opt/ros/groovy/stacks/xacro/src/xacro.py", line 542, in main
    doc = parse(f)
  File "/usr/lib/python2.7/xml/dom/minidom.py", line 1920, in parse
    return expatbuilder.parse(file)
  File "/usr/lib/python2.7/xml/dom/expatbuilder.py", line 928, in parse
    result = builder.parseFile(file)
  File "/usr/lib/python2.7/xml/dom/expatbuilder.py", line 207, in parseFile
    parser.Parse(buffer, 0)
xml.parsers.expat.ExpatError: junk after document element: line 197, column 0

Can you give me some information about how to solve the problem?

Thanks so much!

when I type the roslaunch to try to run the package I create before, the terminal showed that: ERROR: the config file '/opt/ros/groovy/stacks/robot_model_tutorials/urdf_tutorial/urdf.vcg' is a .vcg file, which is the old rviz config format. I can't understand how to change the file, cause I didn't change the content of the urdf_tutorial since I downloaded from ROS. I have no idea about this....is there someone could help me, thanks so much for your time!

now, I don't quite understand the error information like this : File "/home/user/ros_workspace/arbotix/arbotix_python/src/arbotix_python/follow_controller.py", line 32, in <module> from control_msgs.msg import FollowJointTrajectoryAction ImportError: No module named control_msgs.msg how can I find the control_msgs.msg? I don't find it on the website....that's my question..thanks again

hello professors, when I try to use roslaunch command to run the robot, I found some problems that I can't solve it. The error shows that as followed :

Traceback (most recent call last):
File "/home/user/ros_workspace/arbotix/arbotix_python/nodes/driver.py", line 39, in <module>
from arbotix_python.follow_controller import FollowController
File "/home/user/ros_workspace/arbotix/arbotix_python/src/arbotix_python/follow_controller.py", line 32, in <module>
from control_msgs.msg import FollowJointTrajectoryAction
ImportError: No module named control_msgs.msg
[arbotix-1] process has died [pid 12272, exit code 1, cmd /home/user/ros_workspace/arbotix/arbotix_python/nodes/driver.py __name:=arbotix __log:=/home/user/.ros/log/dc7aa468-8815-11e3-98ad-ac72896c0c64/arbotix-1.log].
log file: /home/user/.ros/log/dc7aa468-8815-11e3-98ad-ac72896c0c64/arbotix-1*.log

I try to find control_msgs.msg on the internet, but I can't find it, if you have some information about this, please help me. Thanks again for your time.

And my launch file is as followed:

<launch>  
    <param name="/use_sim_time" value="false" />  

    <!-- Load the URDF/Xacro model of our robot -->  
    <arg name="urdf_file" default="$(find xacro)/xacro.py '$(find smartcar_description)/urdf/smartcar.urdf.xacro'" />  
    <arg name="gui" default="false" />  

    <param name="robot_description" command="$(arg urdf_file)" />  
    <param name="use_gui" value="$(arg gui)"/>  

    <node name="arbotix" pkg="arbotix_python" type="driver.py" output="screen">  
        <rosparam file="$(find smartcar_description)/config/smartcar_arbotix.yaml" command="load" />  
        <param name="sim" value="true"/>  
    </node>  

    <node name="joint_state_publisher" pkg="joint_state_publisher" type="joint_state_publisher" >  
    </node>  

    <node name="robot_state_publisher" pkg="robot_state_publisher" type="state_publisher">  
        <param name="publish_frequency" type="double" value="20.0" />  
    </node>  

     <!-- We need a static transforms for the wheels -->  
    <node pkg="tf" type="static_transform_publisher" name="odom_left_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /left_front_link 100" />  
    <node pkg="tf" type="static_transform_publisher" name="odom_right_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /right_front_link 100" />  

    <node name="rviz" pkg="rviz" type="rviz" args="-d $(find smartcar_description)/urdf.vcg" />  
</launch>