Trying to open vmlinuz(old) using zim leads to assertionerror

[Adarsh Mehta]

This is zim 0.73.5
Platform: posix
Locale: en_IE UTF-8
FS encoding: utf-8
Python: (3, 9, 10, 'final', 0)
PyGObject: (3, 38, 0)

======= Traceback =======
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 930, in main
    ZIM_APPLICATION.run(*argv[1:])
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 687, in run
    self._run_cmd(cmd, args) # test seam
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 717, in _run_cmd
    self._run_main_loop(cmd)
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 759, in _run_main_loop
    w = cmd.run()
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 268, in run
    notebook, page = self.build_notebook()
  File "/usr/lib/python3/dist-packages/zim/main/__init__.py", line 240, in build_notebook
    notebook, uripage = build_notebook(notebookinfo) # can raise FileNotFound
  File "/usr/lib/python3/dist-packages/zim/notebook/__init__.py", line 108, in build_notebook
    path = file.relpath(dir)
  File "/usr/lib/python3/dist-packages/zim/fs.py", line 550, in relpath
    raise AssertionError('Not a parent folder')
AssertionError: Not a parent folder