UnicodeEncodeError while running roslaunch (kinetic)

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Hi there, I'm very new to ROS.

I'm trying to connect my lidar (EAI ydlidar X4) with hector mapping, and downloaded from git clone https://github.com/tu-darmstadt-ros-p...

I've created a launch file (from tutorial online):

<?xml version="1.0"?>
<launch>

  <include file="$(find ydlidar)/launch/lidar_view.launch" />

  <node pkg="tf" type="static_transform_publisher" name="map_to_odom" args="0.0 0.0 0.0 0.0 0.0 0.0 /odom /base_link 40" />

  <node pkg="tf" type="static_transform_publisher" name="base_frame_to_laser" args="0 0 0 0 0 0 /base_link /laser_frame 40" />

  <!--<node pkg="rviz" type="rviz" name="rviz" args="-d $(find hector_slam_launch)/rviz_cfg/mapping_demo.rviz"/>-->

  <include file="$(find hector_mapping)/launch/mapping_default.launch" />
  <node pkg="rviz" type="rviz" name="rviz" args="-d $(find ydlidar)/launch/lidar.rviz" />
  <include file="$(find hector_geotiff)/launch/geotiff_mapper.launch" />
</launch>

however, when I roslaunch it, I got:

Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

'ascii' codec can't encode character u'\xa0' in position 0: ordinal not in range(128)
The traceback for the exception was written to the log file

and in the log:

.......
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line 365, in resolve_args
resolved = _resolve_args(arg_str, context, resolve_anon, commands)
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line 376, in _resolve_args
for a in _collect_args(arg_str):
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line 434, in _collect_args
buff.write(c)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 0: ordinal not in range(128)

[rospy.core][INFO] 2018-10-03 12:28:17,248: signal_shutdown [atexit]

Anyone knows how to solve this?