Making Closed Loop Articulations

My connections
Outside Linear Actuator → Outside Slider → Crank
Inside Linear Actuator → Inside Slider → Loading Flap → Crank
Crank connects back to the Outside Slider, completing the loop.
I am trying to exclude joints but i am confused which one to remove

024-09-19 12:24:39 [575,236ms] [Error] [omni.physx.plugin] RigidBody (/World/robot/shelf_level_zero_frame_horizontal_front_link) appears to be a part of a closed articulation, which is not supported, please exclude one of the joints:
/World/robot/robot_under_cover/back_left_wheel_joint
/World/robot/back_left_wheel_hub/back_left_wheel_hub_one_joint
/World/robot/back_left_wheel_hub/back_left_wheel_hub_two_joint
/World/robot/robot_under_cover/back_right_wheel_joint
/World/robot/back_right_wheel_hub/back_right_wheel_hub_one_joint
/World/robot/back_right_wheel_hub/back_right_wheel_hub_two_joint
/World/robot/base_link
/World/robot/robot_upper_cover/shelf_joint
/World/robot/robot_under_cover/front_left_wheel_joint
/World/robot/front_left_wheel_hub/front_left_wheel_hub_one_joint
/World/robot/front_left_wheel_hub/front_left_wheel_hub_two_joint
/World/robot/robot_under_cover/front_right_wheel_joint
/World/robot/front_right_wheel_hub/front_right_wheel_hub_one_joint
/World/robot/front_right_wheel_hub/front_right_wheel_hub_two_joint
/World/robot/shelf_level_zero_frame_horizontal_front_link/inside_left_actator_joint
/World/robot/inside_left_linear_actuator/inside_left_slider_joint
/World/robot/inside_right_linear_actuator/inside_right_slider_joint
/World/robot/inside_right_slider/loading_flap_inside_right_joint
/World/robot/left_crank/left_crank_loading_flap_joint
/World/robot/inside_left_slider/loading_flap_inside_left_joint
/World/robot/outside_left_linear_actuator/outside_left_slider_joint
/World/robot/outside_left_slider/left_crank_joint
/World/robot/outside_right_linear_actuator/outside_right_slider_joint
/World/robot/outside_right_slider/right_crank_joint
/World/robot/right_crank/right_crank_loading_flap_joint
/World/robot/base_link/base_link_joint
/World/robot/robot_under_cover/robot_upper_cover_joint
/World/robot/base_plate/shelf_level_zero_joint
 from articulation, the joint will be now excluded from the articulation.