gripper cant be shown in the rviz

[GoldenVers]

When I try the commands

cd youbot_description colcon build ros2 launch youbot_description rviz.launch.py

it shows the robot, all except the gripper, it shows a red cube instead, the TF is shown, the joint is shown, but the object itself is just a red cube

I figured that this might be .dae problem, but when I changed the geometry in the youbot.urdf to the arm5_convex.stl rviz was not able to load the mesh file, here is the full code:

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even though the collision geometry was fine with the arm5_convex.stl, to test the issue, I changed it to arm5.dae, it was okay as well.

Can anyone help me with this please?

[GoldenVers]

so I found its the printer joint, I commented it out and the last joint is shown, but there is now another issue, which is the gripper.

I need the gripper so that I can do pick and place simulations..