ROS: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/shoulder_pitch_joint

运行 gazebo_ros_control.launch时，

错误如下：

1. [ERROR] [1571212497.739111392, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/shoulder_pitch_joint

2. [ERROR] [1571212497.744784033, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/elbow_roll_joint

3. [ERROR] [1571212497.747626326, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/elbow_pitch_joint

4. [ERROR] [1571212497.749455772, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/wrist_roll_joint

5. [ERROR] [1571212497.751916855, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/wrist_pitch_joint

6. [ERROR] [1571212497.757109573, 0.166000000]: No p gain specified for pid. Namespace: /gazebo_ros_control/pid_gains/gripper_roll_joint

可忽略此错误，原因见参考文献。

参考：https://answers.ros.org/question/293830/what-is-the-fix-for-no-p-gain-specified-for-pid-namespace-gazebo_ros_controlpid_gainsback_right_wheel_joint-ros-melodic/

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