Joint state with name: “base_l_wheel_joint” was received but not found in URDF

ROS-melodic下运行出现[ WARN] ：Joint state with name: “base_l_wheel_joint” was received but not found in URDF
原因是在robot描述文件URDF中关节定义出错，找到launch文件使用的URDF描述文件，并将left_wheel_joint修改成base_l_wheel_joint，将right_wheel_joint修改为base_r_wheel_joint。