1.出现的现象:Robot description couldn't be retrieved from param server.
Failed to initialize the controller
2.参考资料: diff_drive Robot descripion couldn't be retrieved from param server error - ROS Answers: Open Source Q&A Forum
3. 解决方法:
<param name="vnbot/robot_description" command="$(find xacro)/xacro '$(find vn_robot_description)/urdf/xacro/gazebo/vnbot_with_kinect_gazebo.xacro'" />
之前没有vnbot,要在前面加一个vnbot,vnbot是指建立的urdf模型里面的机器人的名字
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