ORB_SLAM3运行./build_ros.sh后，出现Error from directory check: /opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py /home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3 1

ORB_SLAM3运行./build_ros.sh后，出现:

Building ROS nodes
mkdir: 无法创建目录"build": 文件已存在
[rosbuild] Building package ORB_SLAM3
[rosbuild] Error from directory check: /opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py  /home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3
1
Traceback (most recent call last):
  File "/opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py", line 46, in <module>
    raise Exception
Exception
CMake Error at /opt/ros/kinetic/share/ros/core/rosbuild/private.cmake:102 (message):
  [rosbuild] rospack found package "ORB_SLAM3" at "", but the current
  directory is "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3".  You
  should double-check your ROS_PACKAGE_PATH to ensure that packages are found
  in the correct precedence order.
Call Stack (most recent call first):
  /opt/ros/kinetic/share/ros/core/rosbuild/public.cmake:177 (_rosbuild_check_package_location)
  CMakeLists.txt:4 (rosbuild_init)


-- Configuring incomplete, errors occurred!
See also "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3/build/CMakeFiles/CMakeOutput.log".
See also "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3/build/CMakeFiles/CMakeError.log".
[rosbuild] Building package ORB_SLAM3
[rosbuild] Error from directory check: /opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py  /home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3
1
Traceback (most recent call last):
  File "/opt/ros/kinetic/share/ros/core/rosbuild/bin/check_same_directories.py", line 46, in <module>
    raise Exception
Exception
CMake Error at /opt/ros/kinetic/share/ros/core/rosbuild/private.cmake:102 (message):
  [rosbuild] rospack found package "ORB_SLAM3" at "", but the current
  directory is "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3".  You
  should double-check your ROS_PACKAGE_PATH to ensure that packages are found
  in the correct precedence order.
Call Stack (most recent call first):
  /opt/ros/kinetic/share/ros/core/rosbuild/public.cmake:177 (_rosbuild_check_package_location)
  CMakeLists.txt:4 (rosbuild_init)


-- Configuring incomplete, errors occurred!
See also "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3/build/CMakeFiles/CMakeOutput.log".
See also "/home/xxx/Desktop/ORB_SLAM3/Examples/ROS/ORB_SLAM3/build/CMakeFiles/CMakeError.log".
Makefile:810: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1

在终端输入：

echo ${ROS_PACKAGE_PATH}}

并没有显示出ORB_SLAM3的包路径，说明

export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:"${your path}"/ORB_SLAM3/Examples/ROS

这句话并未加到~/.bashrc文件中，或者加的位置不对（尽量加在最后一行），或者加了后没有运行命令"source ~/.bashrc"。