Having problems reading .STL file in 10-myfirst.urdf

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I am very new to the urdf tutorials. I am trying to load an STL file using 01-myfirst.urdf.

De urdf file looks as follows:

<?xml version="1.0"?>
<robot name="myfirst">
  <link name="base_link">
    <visual>
      <geometry>
        <mesh filename="package://urdf/Part1.stl"/>
      </geometry>
    </visual>
  </link>
</robot>

The file Part1.str is in the urdf folder within the package.

The command I am using in the root of the package:

~/moveit_ws/src/urdf_tutorial$ roslaunch urdf_tutorial display.launch model:=urdf/01-myfirst.urdf

This is the message I am getting is:

[ERROR] [1579020199.142407500]: Could not load resource [package://urdf/Part1.stl]: Unable to open file "package://urdf/Part1.stl".

Part1.stl is an ascii file. On the suggestion on someone else's post I underst I needed to remove the SOLID statement in the file. But to me the system cannot find the Part1.stl file at all.

What am I doing wrong? All help will be appreciated Regards Nico