Gazebo crashing when trying to open model

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I'm working through the URDF tutorials here but I am having trouble with Gazebo. Here is a minimal example:

URDF file (called como.xacro)

<?xml version="1.0" ?>

<robot name="como" xmlns:xacro="http://www.ros.org/wiki/xacro">

  <xacro:property name="PI" value="3.14159265358979"/>
  <xacro:property name="HALF_PI" value="1.57079632679"/>

  <xacro:property name="CHASSIS_HEIGHT" value="0.3"/>
  <xacro:property name="CHASSIS_WIDTH" value="0.2"/>
  <xacro:property name="CHASSIS_LENGTH" value="0.5"/>
  <xacro:property name="CHASSIS_MASS" value="2"/>
  <xacro:property name="CHASSIS_HALF_HEIGHT" value="0.15"/>

  <xacro:property name="WHEEL_RADIUS" value="0.08"/>
  <xacro:property name="WHEEL_WIDTH" value="0.03"/>
  <xacro:property name="WHEEL_POS_X"  value="0.15"/>
  <xacro:property name="WHEEL_POS_Y"  value="0.1"/>
  <xacro:property name="WHEEL_MASS"  value="0.3"/>

  <link name="base_link">
    <visual>
    <origin xyz="0 0 ${CHASSIS_HALF_HEIGHT}" rpy="0 0 0"/>
    <geometry>
      <box size="${CHASSIS_LENGTH} ${CHASSIS_WIDTH} ${CHASSIS_HEIGHT}"/>
    </geometry>
    <material name="orange"/>
    </visual>
    <collision>
      <origin xyz="0 0 ${CHASSIS_HALF_HEIGHT}" rpy="0 0 0"/>
      <geometry>
        <box size="${CHASSIS_LENGTH} ${CHASSIS_WIDTH} ${CHASSIS_HEIGHT}"/>
      </geometry>
    </collision>
    <intertial>
      <origin xyz="0 0 ${CHASSIS_HALF_HEIGHT}" rpy="0 0 0"/>
      <mass value="${CHASSIS_MASS}"/>
      <inertia ixx="0.01" ixy="0.01" ixz="0.01" iyy="0.01" iyz="0.01" izz="0.01"/>
    </intertial>
  </link>

  <gazebo>
    <plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
      <robotNamespace></robotNamespace>
    </plugin>
  </gazebo>
</robot>

And here is my launch file gazebo.launch:

<launch>

  <!-- Gazebo -->
  <arg name="paused" default="false"/>
  <arg name="use_sim_time" default="true"/>
  <arg name="gui" default="true"/>
  <arg name="headless" default="false"/>
  <arg name="debug" default="false"/>
  <arg name="model" default="$(find como_description)/urdf/como.xacro"/>

  <include file="$(find gazebo_ros)/launch/empty_world.launch">
    <arg name="debug" value="$(arg debug)" />
    <arg name="gui" value="$(arg gui)" />
    <arg name="paused" value="$(arg paused)"/>
    <arg name="use_sim_time" value="$(arg use_sim_time)"/>
    <arg name="headless" value="$(arg headless)"/>
  </include>

  <param command="$(find xacro)/xacro $(arg model)" name="robot_description"/>

  <node name="urdf_spawner" pkg="gazebo_ros" type="spawn_model"
        args="-z 1.0 -unpause -urdf -model como -param robot_description" respawn="false" output="screen"/>

  <!-- Combine joint values -->
  <node name="robot_state_publisher" pkg="robot_state_publisher" type="state_publisher"/>

</launch>

I am getting this error:

gzclient: /build/ogre-1.9-B6QkmW/ogre-1.9-1.9.0+dfsg1/OgreMain/include/OgreAxisAlignedBox.h:252: void Ogre::AxisAlignedBox::setExtents(const Ogre::Vector3&, const Ogre::Vector3&): Assertion '(min.x <= max.x && min.y <= max.y && min.z <= max.z) && "The minimum corner of the box must be less than or equal to maximum corner"' failed. Aborted (core dumped)

I looked all over the place and found that this was supposed to have been fixed with some gazebo patch, so I made sure all of my packages and such were updated (I am running Gazebo 9.0.0), and that didn't fix ... (more)