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The following error appeared on some buildbots:
http://buildbot.python.org/all/builders/x86%20Gentoo%203.x/builds/4195/steps/test/logs/stdio
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ERROR: test_ftp (test.test_urllib2net.OtherNetworkTests)
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Traceback (most recent call last):
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 2337, in retrfile
 self.ftp.cwd(file)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/ftplib.py", line 622, in cwd
 return self.voidcmd(cmd)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/ftplib.py", line 272, in voidcmd
 return self.voidresp()
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/ftplib.py", line 245, in voidresp
 resp = self.getresp()
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/ftplib.py", line 240, in getresp
 raise error_perm(resp)
ftplib.error_perm: 550 Failed to change directory.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/test/test_urllib2net.py", line 112, in test_ftp
 self._test_urls(urls, self._extra_handlers())
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/test/test_urllib2net.py", line 218, in _test_urls
 f = urlopen(url, req, TIMEOUT)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/test/test_urllib2net.py", line 33, in wrapped
 return _retry_thrice(func, exc, *args, **kwargs)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
 return func(*args, **kwargs)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 462, in open
 response = self._open(req, data)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 480, in _open
 '_open', req)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 440, in _call_chain
 result = func(*args)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 1464, in ftp_open
 fp, retrlen = fw.retrfile(file, type)
 File "/var/lib/buildslave/3.x.murray-gentoo/build/Lib/urllib/request.py", line 2339, in retrfile
 raise URLError('ftp error: %d' % reason) from reason
TypeError: %d format: a number is required, not error_perm