在使用ROS2时，使用colcon build编译时，报错如下：
1 Starting >>> fishbot_navigation2 2 --- stderr: fishbot_navigation2 3 Traceback (most recent call last): 4 File "/opt/ros/foxy/share/ament_cmake_core/cmake/core/package_xml_2_cmake.py", line 21, in <module> 5 from catkin_pkg.package import parse_package_string 6 ModuleNotFoundError: No module named 'catkin_pkg' 7 CMake Error at /opt/ros/foxy/share/ament_cmake_core/cmake/core/ament_package_xml.cmake:94 (message): 8 execute_process(/home/ros2/miniconda3/bin/python3 9 /opt/ros/foxy/share/ament_cmake_core/cmake/core/package_xml_2_cmake.py 10 /home/ros2/code/fishbot_ws/src/fishbot_navigation2/package.xml 11 /home/ros2/code/fishbot_ws/build/fishbot_navigation2/ament_cmake_core/package.cmake) 12 returned error code 1 13 Call Stack (most recent call first): 14 /opt/ros/foxy/share/ament_cmake_core/cmake/core/ament_package_xml.cmake:49 (_ament_package_xml) 15 /opt/ros/foxy/share/ament_lint_auto/cmake/ament_lint_auto_find_test_dependencies.cmake:31 (ament_package_xml) 16 CMakeLists.txt:34 (ament_lint_auto_find_test_dependencies) 17 18 19 --- 20 Failed <<< fishbot_navigation2 [0.29s, exited with code 1] 21 22 Summary: 0 packages finished [0.42s] 23 1 package failed: fishbot_navigation2 24 1 package had stderr output: fishbot_navigation2
解决方法：
pip3 install catkin_pkg
再次colcon build，成功了！因为此问题困住了好长时间，以前同样的方式没有任何问题，但突然新的工程都没法编译，而唯一的变化就是最近新安装了“conda”，它应该就是这个罪魁祸首了！
标签：xml,core,named,colcon,package,报错,fishbot,ament,cmake From： https://www.cnblogs.com/tdyizhen1314/p/16853418.html