python mechanicy中出错-“mechanicy.\u mechanicy.browserstateerror:not viewing html”

for link in br.links(url_regex="inquiry-results.jsp"):
    cb[link.url] = link

for page_link in cb.values():               
   for link in br.links(url_regex="inquiryDetail.jis"): 
            ....................
      url = link.absolute_url
      br.follow_link(link)
            ......................
   br.follow_link(page_link)

这是我的密码。基本上,它从特定页面提取页面链接[第1、2、3、4、5页的链接…]和数据链接。然后,它进入每个数据链接并提取一些数据,完成后将移动到下一页。但我总是得到这个错误:

Traceback (most recent call last):
  File "C:\python27\test.py", line 95, in <module>
    for link in br.links(url_regex="inquiryDetail.jis"):
  File "build\bdist.win32\egg\mechanize\_mechanize.py", line 405, in links
mechanize._mechanize.BrowserStateError: not viewing HTML

有人能帮忙吗?