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正在运行我的 selenium python 代码并遇到了一个奇怪的错误：

Python[367] (FSEvents.framework) implementation_callback_rpc: ERROR: CFDictionaryGetValue(FSEvents_streamDict, cfPortNumber) => NULL

我四处搜寻，但找不到此错误的含义。有任何想法吗？

编辑：

这是错误所在的代码，但似乎发生了更普遍的事情：

#Go to next page
next_button[0].click()
# Wait until next page has loaded
WebDriverWait(driver,20).until(
        EC.text_to_be_present_in_element_value(
        (By.ID,"MainContent_GridView1_PageCurrent"),`page_count+1`)
)

这是完整的错误消息：

2015-01-13 18:21 Python[510] (FSEvents.framework) implementation_callback_rpc: ERROR: CFDictionaryGetValue(FSEvents_streamDict, cfPortNumber) => NULL
2015-01-13 18:28 Python[510] (FSEvents.framework) implementation_callback_rpc: ERROR: CFDictionaryGetValue(FSEvents_streamDict, cfPortNumber) => NULL
2015-01-13 18:36 Python[510] (FSEvents.framework) implementation_callback_rpc: ERROR: CFDictionaryGetValue(FSEvents_streamDict, cfPortNumber) => NULL
Traceback (most recent call last):
  File "epa_interns.py", line 145, in <module>
    print(main_process(44))
  File "epa_interns.py", line 36, in main_process
    PDF_count = download_pdfs_for_state(driver,state_number,download_folder)
  File "epa_interns.py", line 72, in download_pdfs_for_state
    (By.ID,"MainContent_GridView1_PageCurrent"),`page_count+1`
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/support/wait.py", line 71, in until
    raise TimeoutException(message)
selenium.common.exceptions.TimeoutException: Message:
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