ROS2报错处理（3）--ModuleNotFoundError: No module named ‘catkin_pkg‘

问题1：

colcon build报错

Traceback (most recent call last):
  File "/opt/ros/humble/share/ament_cmake_core/cmake/core/package_xml_2_cmake.py", line 22, in <module>
    from catkin_pkg.package import parse_package_string
ModuleNotFoundError: No module named 'catkin_pkg'

然后后面还有一大段红色

解决1：

应该是在base，先尝试退出

conda deactivate

然后colcon build还是同样的报错，再激活

conda activate

在base中

pip install catkin_pkg

然后（在base中）再colcon build，但是出现了如下黄色警告：

CMake Warning at CMakeLists.txt:12 (add_executable):
  Cannot generate a safe runtime search path for target helloworld because
  files in some directories may conflict with libraries in implicit
  directories:

再退出conda

conda deactivate

最后colcon build， 终于绿色成功了