运行VINS进行cmake时候遇到这个问题，卸载enum却说没install

Question

Base path: /home/ply/catkin_ws
Source space: /home/ply/catkin_ws/src
Build space: /home/ply/catkin_ws/build
Devel space: /home/ply/catkin_ws/devel
Install space: /home/ply/catkin_ws/install
#

Running command: "make cmake_check_build_system" in "/home/ply/catkin_ws/build"

CMake Error at CMakeLists.txt:22 (message):
Search for 'catkin' in workspace failed (catkin_find_pkg catkin
/home/ply/catkin_ws/src): Traceback (most recent call last):

File "/usr/bin/catkin_find_pkg", line 4, in <module>
  import re
File "/usr/lib/python3.6/re.py", line 142, in <module>
  class RegexFlag(enum.IntFlag):

AttributeError: module 'enum' has no attribute 'IntFlag'

Error in sys.excepthook:

Traceback (most recent call last):

File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 62, in apport_excepthook
  if not enabled():
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 24, in enabled
  import re
File "/usr/lib/python3.6/re.py", line 142, in <module>
  class RegexFlag(enum.IntFlag):

AttributeError: module 'enum' has no attribute 'IntFlag'

Original exception was:

Traceback (most recent call last):

File "/usr/bin/catkin_find_pkg", line 4, in <module>
  import re
File "/usr/lib/python3.6/re.py", line 142, in <module>
  class RegexFlag(enum.IntFlag):

AttributeError: module 'enum' has no attribute 'IntFlag'

-- Configuring incomplete, errors occurred!
See also "/home/ply/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ply/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:1132: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed