Can't see the robot in gazebo after spawning the robot.

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Hello ros developers, I use ros 2 Foxy and my problem is when i spawn my robot into gazebo. I can't see the robot . But i see no errors pop up on my terminal. Does anyone know the fix to this issue?

My robot.xacro file below:

#

<?xml version="1.0"?>
<robot xmlns:xacro="http://www.ros.org/wiki/xacro" name="robot">
<xacro:include filename="inertial.xacro"/>
<xacro:arg name="use_ros2_control" default="true"/>

 <!-- Setting the meshes colour  -->
<!-- white -->
 <material name="white">
    <color rgba="1 1 1 1" />
 </material>

 <!-- orange -->
 <material name="orange">
    <color rgba="1 0.3 0.1 1" />
 </material>

 <!-- blue -->
 <material name="blue">
    <color rgba="0.2 0.2 1 1" />
 </material>

 <!-- black -->
 <material name="black">
    <color rgba="0 0 0 1" />
 </material>



<!-- The link to the centre of the robot (called it "base_link") -->
<link name="base_link">

</link>



<!-- link to the chassis  -->
<joint name="chassis_joint" type="fixed">
    <parent link="base_link"/>
    <child link="chassis"/>
<!-- We want the origin of the chassis sitting at the back/centre of the chassis -->
    <origin xyz="-0.1 0 0"/>
</joint>

<link name="chassis">
    <visual>
        <origin xyz="0.15 0 0.075"/>
        <geometry>
            <box size="0.3 0.3 0.15"/>
        </geometry>
        <material name="orange"/>
    </visual>
    <collusion>
        <origin xyz="0.15 0 0.075"/>
        <geometry>
            <box size="0.3 0.3 0.15"/>
        </geometry>
    </collusion>
    <xacro:inertial_box mass="0.5" x="0.3" y="0.3" z="0.15">
     <origin xyz="0.15 0 0.075" rpy="0 0 0"/>
    </xacro:inertial_box>
</link>

<gazebo reference="chassis">
   <material>Gazebo/orange</material>
</gazebo>

<!-- The left wheel link  -->
<joint name="left_wheel_joint" type="continuous">
  <parent link="base_link"/>
  <child link="left_wheel"/>
  <origin xyz="0 0.175 0" rpy="-${pi/2} 0 0"/>
  <axis xyz="0 0 1"/>
</joint>

<link name="left_wheel">
 <visual>
    <geometry>
       <cylinder radius="0.05" length="0.04"/> 
    </geometry>
    <material name="black"/>
 </visual>
 <collusion>
    <geometry>
       <cylinder radius="0.05" length="0.04"/> 
    </geometry>
    <material name="black"/>
 </collusion>
 <xacro:inertial_cylinder mass="0.1" length="0.04" radius="0.05">
  <origin xyz="0 0 0" rpy="0 0 0"/>
 </xacro:inertial_cylinder>
</link>

<gazebo reference="left_wheel">
   <material>Gazebo/black</material>
</gazebo>




<!-- The right wheel link  -->
<joint name="right_wheel_joint" type="continuous">
  <parent link="base_link"/>
  <child link="right_wheel"/>
  <origin xyz="0 -0.175 0" rpy="${pi/2} 0 0"/>
  <axis xyz="0 0 -1"/>
</joint>

<link name="right_wheel">
 <visual>
    <geometry>
       <cylinder radius="0.05" length="0.04"/> 
    </geometry>
    <material name="black"/>
 </visual>
 <collusion>
    <geometry>
       <cylinder radius="0.05" length="0.04 ...