I met this problem when I run ``roslaunch rrt_exploration single.launch``:
```
process[assigner-4]: started with pid [2735]
  File "/home/wangyawei/RosWorkspace/rrt_exploration_ws/src/rrt_exploration/scripts/filter.py", line 67
    for i in range(0,n_robots):
                              ^
TabError: inconsistent use of tabs and spaces in indentation
[filter-3] process has died [pid 2728, exit code 1, cmd /home/wangyawei/RosWorkspace/rrt_exploration_ws/src/rrt_exploration/scripts/filter.py __name:=filter __log:=/home/wangyawei/.ros/log/c300c286-92ae-11e7-8bc9-f48e38f12209/filter-3.log].
log file: /home/wangyawei/.ros/log/c300c286-92ae-11e7-8bc9-f48e38f12209/filter-3*.log
Traceback (most recent call last):
  File "/home/wangyawei/RosWorkspace/rrt_exploration_ws/src/rrt_exploration/scripts/assigner.py", line 5, in <module>
    import rospy
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/__init__.py", line 49, in <module>
    from .client import spin, myargv, init_node, \
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/client.py", line 52, in <module>
    import roslib
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslib/__init__.py", line 54, in <module>
    import roslib.stacks
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslib/stacks.py", line 46, in <module>
    import roslib.packages
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslib/packages.py", line 49, in <module>
    from catkin.find_in_workspaces import find_in_workspaces as catkin_find
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/catkin/find_in_workspaces.py", line 36, in <module>
    from catkin_pkg.packages import find_packages
ModuleNotFoundError: No module named 'catkin_pkg'
[assigner-4] process has died [pid 2735, exit code 1, cmd /home/wangyawei/RosWorkspace/rrt_exploration_ws/src/rrt_exploration/scripts/assigner.py __name:=assigner __log:=/home/wangyawei/.ros/log/c300c286-92ae-11e7-8bc9-f48e38f12209/assigner-4.log].
log file: /home/wangyawei/.ros/log/c300c286-92ae-11e7-8bc9-f48e38f12209/assigner-4*.log

```

The first error I think is source code format problem. I hope you could check the source code.
For the second, I run ``pip install catkin_pkg`` but nothing help. And the error still exist. This is my result of install:
```
wangyawei@wangyawei-pc:~/RosWorkspace/rrt_exploration_ws/src/rrt_exploration$ pip install catkin_pkg
Collecting catkin_pkg
  Downloading catkin_pkg-0.3.6.tar.gz (44kB)
    100% || 51kB 414kB/s 
Collecting argparse (from catkin_pkg)
  Downloading argparse-1.4.0-py2.py3-none-any.whl
Collecting docutils (from catkin_pkg)
  Downloading docutils-0.14-py2-none-any.whl (543kB)
    100% || 552kB 1.3MB/s 
Collecting python-dateutil (from catkin_pkg)
  Downloading python_dateutil-2.6.1-py2.py3-none-any.whl (194kB)
    100% || 194kB 541kB/s 
Collecting six>=1.5 (from python-dateutil->catkin_pkg)
  Downloading six-1.10.0-py2.py3-none-any.whl
Building wheels for collected packages: catkin-pkg
  Running setup.py bdist_wheel for catkin-pkg ... done
  Stored in directory: /home/wangyawei/.cache/pip/wheels/6c/ae/84/bea62c6c5c4334ceb4306854c5294801305858a1cc021dc219
Successfully built catkin-pkg
Installing collected packages: argparse, docutils, six, python-dateutil, catkin-pkg
Successfully installed argparse-1.2.1 catkin-pkg-0.3.6 docutils-0.14 python-dateutil-1.5 six-1.10.0
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

```





---
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