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Hello, was your robot working without the ros_control packge? Could you post the URDF from your robot? I think you are following this tutorial, right? Maybe you are missing a single quote on the joint's name:

# Position Controllers ---------------------------------------
left_wheel:
    type: effort_controllers/JointVelocityController
    joint: 'holder2wheel_left'
    pid: {p: 100.0, i: 0.01, d: 10.0}

Even if you get it to work, I suggest to use the diff_drive_controller. It seems more adequate for a rover robot.