ERROR: No p gain specified for pid

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Hi! I'm following this MoveIt! tutorial and I'm having a problem with loading the controllers. I get the error: "No p gain specified for pid. Namespace: /weld_robot/gazebo_ros_control/pid_gains/...". You can see it in the I have created a file pid_gains.yaml with gazebo_ros_control/pid_gains as suggested here in the comments and added the necessary line to my flexweld/launch/flexweld_gazebo.launch file, but I still get the error. I would highly appreciate if anybody has any suggestion how to fix this error. You can find my project here.