OSError: [Errno 28] inotify watch limit reached

2019-09-16 16:19:31 4858 139928382588672 ERROR    nxdrive.engine.workers Thread EXCEPTION
Traceback (most recent call last):
  File "engine/workers.py", line 181, in run
    self._execute()
  File "engine/watcher/local_watcher.py", line 96, in _execute
    self._setup_watchdog()
  File "engine/activity.py", line 223, in func_wrapper
    func(*args, **kwargs)
  File "engine/watcher/local_watcher.py", line 628, in _setup_watchdog
    observer.start()
  File ".../watchdog/observers/api.py", line 253, in start
    emitter.start()
  File ".../watchdog/utils/__init__.py", line 110, in start
    self.on_thread_start()
  File ".../watchdog/observers/inotify.py", line 121, in on_thread_start
    self._inotify = InotifyBuffer(path, self.watch.is_recursive)
  File ".../watchdog/observers/inotify_buffer.py", line 35, in __init__
    self._inotify = Inotify(path, recursive)
  File ".../watchdog/observers/inotify_c.py", line 200, in __init__
    self._add_dir_watch(path, recursive, event_mask)
  File ".../watchdog/observers/inotify_c.py", line 395, in _add_dir_watch
    self._add_watch(full_path, mask)
  File ".../watchdog/observers/inotify_c.py", line 409, in _add_watch
    Inotify._raise_error()
  File ".../watchdog/observers/inotify_c.py", line 421, in _raise_error
    raise OSError(errno.ENOSPC, "inotify watch limit reached")
OSError: [Errno 28] inotify watch limit reached