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Hi, I have managed to solve it like this, hope it will help to some one :), this just the piece of code that called the slot.

self._widget.autonomous.pressed.connect(self._load_launchfile_slot)

@Slot(str) def _load_launchfile_slot(self): launchfile_name = 'patrolbot_navigation.launch' folder_name_launchfile = 'launch' pkg_name = 'patrol_navigation'

    try:
         #launchfile = os.path.join(rospkg.RosPack().get_path(pkg_name), folder_name_launchfile, launchfile_name)
         #print( launchfile)
        args =  roslaunch.rlutil.resolve_launch_arguments([pkg_name, launchfile_name])
        rospy.loginfo("Starting task: %s"%args)
        runner = roslaunch.parent.ROSLaunchParent( rospy.get_param("/run_id"), args)
        runner.start()
    except IndexError as e:
        raise RLException('IndexError: {}'.format(e.message))

Hi, I have managed to solve it like this, hope it will help to some one :), this just the piece of code that called the slot.

 self._widget.autonomous.pressed.connect(self._load_launchfile_slot)
  
@Slot(str)
 def _load_launchfile_slot(self):
  @Slot(str)

   def _load_launchfile_slot(self):

    launchfile_name = 'patrolbot_navigation.launch'
     folder_name_launchfile = 'launch'
     pkg_name  =  'patrol_navigation''patrol_navigation'
  
    try:
         #launchfile = os.path.join(rospkg.RosPack().get_path(pkg_name), folder_name_launchfile, launchfile_name)
         #print( launchfile)
        args =  roslaunch.rlutil.resolve_launch_arguments([pkg_name, launchfile_name])
        rospy.loginfo("Starting task: %s"%args)
        runner = roslaunch.parent.ROSLaunchParent( rospy.get_param("/run_id"), args)
        runner.start()
    except IndexError as e:
        raise RLException('IndexError: {}'.format(e.message))