Why is Rviz not loading my .dae file for my robot?

edit

I am working on designing a small recon robot and have developed a number of meshes in blender for use in the robot. I am now trying to implement them in a .urdf file so as to be able to load them in rviz. However, whenever I try to load them using the command:

roslaunch urdf_tutorial display.launch model:=urdf/bilkins.urdf

rviz does not load up the model and this error repeats on the terminal:

[ERROR] [1600873487.235408365]: Could not load resource [package://urdf_tutorial/meshes/chassis.dae]: Unable to open file `"package://urdf_tutorial/meshes/chassis.dae".`
[ WARN] [1600873487.236670494]: OGRE EXCEPTION(6:FileNotFoundException): Cannot locate resource `package://urdf_tutorial/meshes/chassis.dae in resource group Autodetect or any other group. in `ResourceGroupManager::openResource at /build/ogre-1.9-B6QkmW/ogre-1.9- 1.9.0+dfsg1/OgreMain/src/OgreResourceGroupManager.cpp (line 756)

The .urdf file for my robot is as follows:

<?xml version="1.0"?>
<robot name="myfirst">
  <link name="base_link">
    <visual>
      <origin rpy="0.0 0 0" xyz="0 0 0"/>
      <geometry>
        <mesh filename="package://urdf_tutorial/meshes/chassis.dae"/>
      </geometry>
    </visual>
    <collision>
      <geometry>
        <mesh filename="package://urdf_tutorial/meshes/chassis.dae"/>
      </geometry>
      <origin rpy="0.0 0 0" xyz="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.05"/>
      <inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
    </inertial>
  </link>
</robot>

I am using Melodic on Ubuntu 18.04.4 LTS