python watchdog错误：OSError：[WinError 87]参数不正确

我试图在每次文件更改时运行一个函数。看门狗似乎是不进行轮询的主要解决方案。

但是我的代码返回错误：

Exception in thread Thread-14:
Traceback (most recent call last):
  File "C:\Users\Administrator\Anaconda3\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\api.py", line 146, in run
    self.queue_events(self.timeout)
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\read_directory_changes.py", line 77, in queue_events
    winapi_events = read_events(self._handle, self.watch.is_recursive)
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\winapi.py", line 347, in read_events
    buf, nbytes = read_directory_changes(handle, recursive)
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\winapi.py", line 307, in read_directory_changes
    raise e
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\winapi.py", line 303, in read_directory_changes
    ctypes.byref(nbytes), None, None)
  File "C:\Users\Administrator\Anaconda3\lib\site-packages\watchdog\observers\winapi.py", line 108, in _errcheck_bool
    raise ctypes.WinError()
OSError: [WinError 87] The parameter is incorrect.

该代码直接来自文档，并粘贴在下面：

import time
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler


class MyHandler(FileSystemEventHandler):
    def on_modified(self, event):
        print("Got it!")


if __name__ == "__main__":
    event_handler = MyHandler()
    observer = Observer()
    observer.schedule(event_handler, path='C:/Email_forwarding/Attachments/Sales/test.txt', recursive=False)
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

我在Windows Server 2012上使用看门狗0.8.3运行Python 3.6（Anaconda）。

编辑：尝试降级到Python 3.5.2，但仍然出现相同的错误。