How to open demo_gmapping.launch without rosbag?

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Hello everyone. I launch the demo_gmapping.launch by "roslaunch laser_scan_matcher demo_gmapping.launch" command but it uses bag file. I don't want to work with bag file. How can i fix it?

I've tried to delete this part:

<node pkg="rosbag" type="play" name="play" 
args="$(find laser_scan_matcher)/demo/demo.bag --delay=5 --clock"/>

However when i do that i receive an error: RLException: Invalid roslaunch XML syntax: not well-formed (invalid token): line 13, column 53 The traceback for the exception was written to the log file

This is default demo_gmapping.launch file:

 <launch>

  #### set up data playback from bag #############################

  <param name="/use_sim_time" value="true"/>

  <node pkg="rosbag" type="play" name="play" 
    args="$(find laser_scan_matcher)/demo/demo.bag --delay=5 --clock"/>

  #### publish an example base_link -> laser transform ###########

  <node pkg="tf" type="static_transform_publisher" name="base_link_to_laser" 
    args="0.0 0.0 0.0 0.0 0.0 0.0 /base_link /laser 40" />

  #### start rviz ################################################

  <node pkg="rviz" type="rviz" name="rviz" 
    args="-d $(find laser_scan_matcher)/demo/demo_gmapping.rviz"/>

  #### start the laser scan_matcher ##############################

  <node pkg="laser_scan_matcher" type="laser_scan_matcher_node" 
    name="laser_scan_matcher_node" output="screen">

    <param name="fixed_frame" value = "odom"/>
    <param name="max_iterations" value="10"/>

  </node>

  #### start gmapping ############################################

  <node pkg="gmapping" type="slam_gmapping" name="slam_gmapping" output="screen">
    <param name="map_udpate_interval" value="1.0"/>
    <param name="maxUrange" value="5.0"/>
    <param name="sigma" value="0.1"/>
    <param name="kernelSize" value="1"/>
    <param name="lstep" value="0.15"/>
    <param name="astep" value="0.15"/>
    <param name="iterations" value="1"/>
    <param name="lsigma" value="0.1"/>
    <param name="ogain" value="3.0"/>
    <param name="lskip" value="1"/>
    <param name="srr" value="0.1"/>
    <param name="srt" value="0.2"/>
    <param name="str" value="0.1"/>
    <param name="stt" value="0.2"/>
    <param name="linearUpdate" value="1.0"/>
    <param name="angularUpdate" value="0.5"/>
    <param name="temporalUpdate" value="0.4"/>
    <param name="resampleThreshold" value="0.5"/>
    <param name="particles" value="10"/>
    <param name="xmin" value="-5.0"/>
    <param name="ymin" value="-5.0"/>
    <param name="xmax" value="5.0"/>
    <param name="ymax" value="5.0"/>
    <param name="delta" value="0.02"/>
    <param name="llsamplerange" value="0.01"/>
    <param name="llsamplestep" value="0.05"/>
    <param name="lasamplerange" value="0.05"/>
    <param name="lasamplestep" value="0.05"/>
  </node>

</launch>