Error Opening GUI

[ape33]

When opening an energy file I suddenly get an error which i didn't get previously:

pqenalyzer k_water-md-01.en
INFO: Detected PQ energy input.
Traceback (most recent call last):
  File "/home/ape/.conda/envs/pq/bin/pqenalyzer", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/PQEnalyzer/__main__.py", line 141, in main
    app.build()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/PQEnalyzer/apps/app.py", line 100, in build
    self.__auto_refresh_control_event()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/PQEnalyzer/apps/app.py", line 216, in __auto_refresh_control_event
    if self.__start_file_watcher():
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/PQEnalyzer/apps/app.py", line 236, in __start_file_watcher
    if watcher.start():
       ^^^^^^^^^^^^^^^
  File "<@beartype(PQEnalyzer.apps.file_watcher.FileChangeWatcher.start) at 0x7f28f7e8aac0>", line 10, in start
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/PQEnalyzer/apps/file_watcher.py", line 63, in start
    self.observer.start()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/observers/api.py", line 264, in start
    emitter.start()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/utils/__init__.py", line 75, in start
    self.on_thread_start()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/observers/inotify.py", line 119, in on_thread_start
    self._inotify = InotifyBuffer(path, recursive=self.watch.is_recursive, event_mask=event_mask)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/observers/inotify_buffer.py", line 30, in __init__
    self._inotify = Inotify(path, recursive=recursive, event_mask=event_mask)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/observers/inotify_c.py", line 149, in __init__
    Inotify._raise_error()
  File "/home/ape/.conda/envs/pq/lib/python3.12/site-packages/watchdog/observers/inotify_c.py", line 438, in _raise_error
    raise OSError(errno.EMFILE, "inotify instance limit reached")
OSError: [Errno 24] inotify instance limit reached

I get this on the main branch. What could be the issue?

[galjos]

Confirmed: the energy file is parsed successfully. Linux rejects the native watcher because the per-user inotify instance limit is already exhausted, usually by other running watcher processes.

#90 cleans up the failed observer and falls back to polling. The GUI keeps opening, auto-refresh continues, and the status shows (polling). The regression reproduces EMFILE, and a real polling observer was verified against an actual file update.