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Afte running roslaunch xela_server service.launch , I came across this error which I could not fix.
I am using ROS-KINETIC which does not work with python3, only python2. My virtual env python version is 3.5 so I am not sure why this error occurs but my best guess is that it is due to the fact that python2 does not support metaclass .

Traceback (most recent call last):
File "/opt/ros/kinetic/bin/roslaunch", line 34, in
import roslaunch
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/ init .py", line 51, in
from . import param_dump as roslaunch_param_dump
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/param_dump.py", line 40, in
import roslaunch.config
File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/config.py", line 45, in
import rospkg.distro
File "/home/yetty/xela/venv/lib/python3.5/site-packages/rospkg/distro.py", line 44, in
import yaml
File "/home/yetty/xela/venv/lib/python3.5/site-packages/yaml/ init .py", line 284
class YAMLObject(metaclass=YAMLObjectMetaclass):
SyntaxError: invalid syntax