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try changing

nh.subscribe("joint1_controller/state", 10, this->joint_state_cb);

to: nh.subscribe("joint1_controller/state", 10, &joint_move::joint_state_cb);

try ~~changing~~

changing: nh.subscribe("joint1_controller/state", 10, this->joint_state_cb);
this->joint_state_cb);

to: nh.subscribe("joint1_controller/state", 10, &joint_move::joint_state_cb);

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