when I roslaunch turtlebot_navigation gmapping_demo.launch I get this error:

while processing /opt/ros/kinetic/share/turtlebot_bringup/launch/3dsensor.launch:
while processing /opt/ros/kinetic/share/turtlebot_bringup/launch/includes/3dsensor/d435.launch.xml:
while processing opt/ros/kinetic/share/realsense2_camera/launch/rs_d435_camera_with_model.launch:
Invalid roslaunch XML syntax: [Errno 2] No such file or directory: u'opt/ros/kinetic/share/realsense2_camera/launch/rs_d435_camera_with_model.launch'
The traceback for the exception was written to the log file

The file in question(d435.launch.xml) is this:

<launch>
<!--
 "camera" should uniquely identify the device. All topics are pushed down
       into the "camera" namespace, and it is prepended to tf frame ids. 
-->
<arg name="camera" default="camera"/>
<arg name="publish_tf" default="false"/>
<!--
 Factory-calibrated depth registration 
       NOTE: HW Registration not supported by R200 camera 
-->
<arg name="depth_registration" default="false"/>
<arg if="$(arg depth_registration)" name="depth" value="depth_registered"/>
<arg unless="$(arg depth_registration)" name="depth" value="depth"/>
<!-- Processing Modules -->
<arg name="rgb_processing" default="true"/>
<arg name="ir_processing" default="true"/>
<arg name="depth_processing" default="true"/>
<arg name="depth_registered_processing" default="true"/>
<arg name="disparity_processing" default="true"/>
<arg name="disparity_registered_processing" default="true"/>
<arg name="scan_processing" default="true"/>
<!-- Worker threads for the nodelet manager -->
<arg name="num_worker_threads" default="4"/>
<include file="opt/ros/kinetic/share/realsense2_camera/launch/rs_d435_camera_with_model.launch">
<arg name="camera" value="$(arg camera)"/>
<arg name="camera_type" value="d435"/>
<arg name="publish_tf" value="$(arg publish_tf)"/>
<arg name="num_worker_threads" value="$(arg num_worker_threads)"/>
<!-- Processing Modules -->
<arg name="rgb_processing" value="$(arg rgb_processing)"/>
<arg name="ir_processing" value="$(arg ir_processing)"/>
<arg name="depth_processing" value="$(arg depth_processing)"/>
<arg name="depth_registered_processing" value="$(arg depth_registered_processing)"/>
<arg name="disparity_processing" value="$(arg disparity_processing)"/>
<arg name="disparity_registered_processing" value="$(arg disparity_registered_processing)"/>
</include>
</launch>

The file the error says is missing, is in actuality, not missing at all. This is the file:

<launch>
  <arg name="serial_no"           default=""/>
  <arg name="json_file_path"      default=""/>
  <arg name="camera"              default="camera"/>
  <arg name="tf_prefix"           default="$(arg camera)"/>
  <arg name="external_manager"    default="false"/>
  <arg name="manager"             default="realsense2_camera_manager"/>

  <arg name="fisheye_width"       default="640"/>
  <arg name="fisheye_height"      default="480"/>
  <arg name="enable_fisheye"      default="false"/>

  <arg name="depth_width"         default="640"/>
  <arg name="depth_height"        default="480"/>
  <arg name="enable_depth"        default="true"/>

  <arg name="infra_width"        default="640"/>
  <arg name="infra_height"       default="480"/>
  <arg name="enable_infra1"       default="true"/>
  <arg name="enable_infra2"       default="true"/>

  <arg name="color_width"         default="640"/>
  <arg name="color_height"        default="480"/>
  <arg name="enable_color"        default="true"/>

  <arg name="fisheye_fps"         default="30"/>
  <arg name="depth_fps"           default="30"/>
  <arg name="infra_fps"           default="30"/>
  <arg name="color_fps"           default="30"/>
  <arg name="gyro_fps"            default="400"/>
  <arg name="accel_fps"           default="250"/>
  <arg name="enable_gyro"         default="true"/>
  <arg name="enable_accel"        default="true"/>

  <arg name="enable_pointcloud"         default="false"/>
  <arg name="pointcloud_texture_stream" default="RS2_STREAM_COLOR"/>
  <arg name="pointcloud_texture_index"  default="0"/>

  <arg name="enable_sync"               default="false"/>
  <arg name="align_depth"               default="false"/>

  <arg name="filters"                   default="pointcloud"/>
  <arg name="clip_distance"             default="-2"/>
  <arg name="linear_accel_cov"          default="0.01"/>
  <arg name="initial_reset"             default="false"/>
  <arg name="unite_imu_method"          default=""/>
  <arg name="topic_odom_in"             default="odom_in"/>
  <arg name="calib_odom_file"           default=""/>
  <arg name="publish_odom_tf"           default="true"/>
  <arg name="allow_no_texture_points"   default="false"/>

  <group ns="$(arg camera)">
    <include file="$(find realsense2_camera)/launch/includes/nodelet.launch.xml">
      <arg name="tf_prefix"                value="$(arg tf_prefix)"/>
      <arg name="external_manager"         value="$(arg external_manager)"/>
      <arg name="manager"                  value="$(arg manager)"/>
      <arg name="serial_no"                value="$(arg serial_no)"/>
      <arg name="json_file_path"           value="$(arg json_file_path)"/>

      <arg name="enable_pointcloud"        value="$(arg enable_pointcloud)"/>
      <arg name="pointcloud_texture_stream" value="$(arg pointcloud_texture_stream)"/>
      <arg name="pointcloud_texture_index"  value="$(arg pointcloud_texture_index)"/>
      <arg name="enable_sync"              value="$(arg enable_sync)"/>
      <arg name="align_depth"              value="$(arg align_depth)"/>

      <arg name="fisheye_width"            value="$(arg fisheye_width)"/>
      <arg name="fisheye_height"           value="$(arg fisheye_height)"/>
      <arg name="enable_fisheye"           value="$(arg enable_fisheye)"/>

      <arg name="depth_width"              value="$(arg depth_width)"/>
      <arg name="depth_height"             value="$(arg depth_height)"/>
      <arg name="enable_depth"             value="$(arg enable_depth)"/>

      <arg name="color_width"              value="$(arg color_width)"/>
      <arg name="color_height"             value="$(arg color_height)"/>
      <arg name="enable_color"             value="$(arg enable_color)"/>

      <arg name="infra_width"              value="$(arg infra_width)"/>
      <arg name="infra_height"             value="$(arg infra_height)"/>
      <arg name="enable_infra1"            value="$(arg enable_infra1)"/>
      <arg name="enable_infra2"            value="$(arg enable_infra2)"/>

      <arg name="fisheye_fps"              value="$(arg fisheye_fps)"/>
      <arg name="depth_fps"                value="$(arg depth_fps)"/>
      <arg name="infra_fps"                value="$(arg infra_fps)"/>
      <arg name="color_fps"                value="$(arg color_fps)"/>
      <arg name="gyro_fps"                 value="$(arg gyro_fps)"/>
      <arg name="accel_fps"                value="$(arg accel_fps)"/>
      <arg name="enable_gyro"              value="$(arg enable_gyro)"/>
      <arg name="enable_accel"             value="$(arg enable_accel)"/>

      <arg name="filters"                  value="$(arg filters)"/>
      <arg name="clip_distance"            value="$(arg clip_distance)"/>
      <arg name="linear_accel_cov"         value="$(arg linear_accel_cov)"/>
      <arg name="initial_reset"            value="$(arg initial_reset)"/>
      <arg name="unite_imu_method"         value="$(arg unite_imu_method)"/>
      <arg name="topic_odom_in"            value="$(arg topic_odom_in)"/>
      <arg name="calib_odom_file"          value="$(arg calib_odom_file)"/>
      <arg name="publish_odom_tf"          value="$(arg publish_odom_tf)"/>
      <arg name="allow_no_texture_points"  value="$(arg allow_no_texture_points)"/>
    </include>
  </group>

  <!-- Loads the camera model -->
  <param name="robot_description" command="$(find xacro)/xacro --inorder '$(find realsense2_description)/urdf/test_d435_camera.urdf.xacro' use_nominal_extrinsics:=false"/>

  <node name="robot_state_publisher" pkg="robot_state_publisher" type="robot_state_publisher"/>
  <node name="rviz" pkg="rviz" type="rviz" args="-d $(find realsense2_description)/rviz/urdf.rviz" required="true"/>
</launch>

Not sure why I am getting this error