Page cannot be edited, "PageNotFoundError"

[Gwendal]

For some unknown reason, the content of one of my pages has disappeared, and the remaining "zombie" page cannot be renamed or deleted.

I have the following errors that pop up when trying various interactions with this zombie page:

ERROR: Error in operation:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/notebook/operations.py", line 263, in __iter__
    progress = next(self._do_work)
  File "/usr/lib/python2.7/site-packages/zim/notebook/notebook.py", line 817, in rename_page_iter
    for p in self.move_page_iter(path, newpath, update_links):
  File "/usr/lib/python2.7/site-packages/zim/notebook/notebook.py", line 571, in move_page_iter
    self._move_file_and_folder(path, newpath)
  File "/usr/lib/python2.7/site-packages/zim/notebook/notebook.py", line 591, in _move_file_and_folder
    raise PageNotFoundError(path)
PageNotFoundError: Pas de page: ResearchOrProjects:LieberLieber:LieberLieber-QVT:2016-07-12 LL

ERROR: Exception in signal handler for file-row-inserted on <zim.notebook.index.files.FilesIndexer object at 0x7f9ff58d3810>
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/signals.py", line 338, in emit
    r = handler(self, *args)
  File "/usr/lib/python2.7/site-packages/zim/notebook/index/pages.py", line 121, in on_file_row_inserted
    raise NotImplementedError
NotImplementedError

ERROR: Exception in signal handler for file-row-deleted on <zim.notebook.index.files.FilesIndexer object at 0x7f9ff58d3810>
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/signals.py", line 338, in emit
    r = handler(self, *args)
  File "/usr/lib/python2.7/site-packages/zim/notebook/index/pages.py", line 164, in on_file_row_deleted
    raise NotImplemented # some conflict removed