AttributeError: 'module' object has no attribute 'main'

本机环境：ubuntu16.04,  ros-kinetic

$ roscore

报错

Traceback (most recent call last):
  File "/opt/ros/kinetic/bin/roscore", line 70, in <module>
    roslaunch.main(['roscore', '--core'] + sys.argv[1:])
AttributeError: 'module' object has no attribute 'main'

经过多番检索和尝试，终于找出了原因.

首先查看环境变量

$ env | grep ROS

输出如下

ROS_ROOT=/opt/ros/kinetic/share/ros
ROS_PACKAGE_PATH=/home/gordon/ros_ws/src:/opt/ros/kinetic/share
ROS_MASTER_URI=http://localhost:11311
ROSCONSOLE_CONFIG_FILE=/home/gordon/ros_ws/src/ros_comm/tools/rosconsole/config/rosconsole.config
ROS_VERSION=1
ROSLISP_PACKAGE_DIRECTORIES=/home/gordon/ros_ws/devel/share/common-lisp
ROS_DISTRO=kinetic
ROS_ETC_DIR=/opt/ros/kinetic/etc/ros

高亮处变量，本应该如下所示。

ROSCONSOLE_CONFIG_FILE=/opt/ros/kinetic/share/ros/config/rosconsole.config

检查后发现，之前下载在工作空间的ros_comm源码包，与ros内置的工具文件互相冲突。

解决方法：

1）移除ros_comm源码包，移除工作空间中的devel文件夹

2） export ROSCONSOLE_CONFIG_FILE=/opt/ros/kinetic/share/ros/config/rosconsole.config 

3）再次 catkin_make