Hello , I'am run my robot on rviz and the when i make the Robot model i can not make the map at Base_link it start from link _1 he did not see the base link and this what shows to me I have the deadline tomorrow and i need help

This is the urdf file:

 <?xml version="1.0" encoding="utf-8"?>
   <!-- This URDF was automatically
   created by SolidWorks to URDF
  Exporter! Originally created by
  Stephen Brawner (brawner@gmail.com) 
 Commit Version: 1.6.0-4-g7f85cfe  Build Version: 1.6.7995.38578
 For more information, please see http://wiki.ros.org/sw_urdf_exporter
  --> <robot   name="urdf_assem">   <link
name="base_link">
<inertial>
  <origin
    xyz="0.064084 0.12205 0.0761"
    rpy="0 0 0" />
  <mass
    value="0.25147" />
  <inertia
    ixx="0.00020313"
    ixy="-8.6944E-06"
    ixz="8.9277E-07"
    iyy="0.00028032"
    iyz="-1.0213E-06"
    izz="0.00021063" />
</inertial>
<visual>
  <origin
    xyz="0 0 0"
    rpy="0 0 0" />
  <geometry>
    <mesh
      filename="package://urdf_assem/meshes/base_link.STL"

/>