URDF file cannot load meshes when using relative file paths

[author31]

I'm modifying the gripper of franka emika robotic arm, I updated with my own version of urdf and not thing shown on the URDF viewer

<?xml version="1.0" ?>
<robot name="panda" xmlns:xacro="http://www.ros.org/wiki/xacro">
  <link name="panda_link0">
    <visual>
      <geometry>
        <mesh filename="../meshes/visual/link0.dae"/>
      </geometry>
    </visual>
    <collision>
      <geometry>
        <mesh filename="../meshes/collision/link0.obj"/>
      </geometry>
       ...
</robot>