Roslaunch relaunch fails: bad roslaunch process monitor initialization: process monitor is already dead

edit

Hi!

I'm using roslanches in my custom app. The first time I use a custom roslaunch "X" I don't have any problem. However, the second time it gives the following error:

  File "/opt/ros/melodic/lib/python2.7/dist-packages/roslaunch/launch.py", line 297, in __init__
    raise RLException("bad roslaunch process monitor initialization: process monitor is already dead")
roslaunch.core.RLException: bad roslaunch process monitor initialization: process monitor is already dead
Abortado (`core' generado)

Does anybody know why is this happening??? I tried to exec another roslaunch for testing (gazebo roslaunch) many times and didn't have this issue

Edit: Ros: Melodic OS: Ubuntu 18.04

Launch file:

<launch>

  <!-- Custom roslaunch -->


  <!-- Arguments -->
  <arg name="model" default="$(env TURTLEBOT3_MODEL)" doc="model type [burger, waffle, waffle_pi]"/>
  <arg name="map_file" default="$(find rsgv_navigation)/maps/mapa_house.yaml"/>
  <arg name="open_rviz" default="true"/>
  <arg name="move_forward_only" default="false"/>

  <!--WORLD-->
  <include 
      file="$(find rsgv_description)/launch/rsgv_world.launch">
  </include>

  <!-- Map server -->
  <!-- Provides the map_server ROS Node,which offers map data as a ROS Service. -->
  <!-- It also provides the map_saver command-line utility, which allows dynamically generated maps to be saved to file. -->
  <!--node pkg="map_server" name="map_server" type="map_server" args="$(arg map_file)"/-->


  <!-- rviz -->
  <!--group if="$(arg open_rviz)"> 
    <node pkg="rviz" type="rviz" name="rviz" required="true"
          args="-d $(find turtlebot3_navigation)/rviz/turtlebot3_navigation.rviz"/>
  </group-->

</launch>