F8 anaconda error: AttributeError: UrlInstallMethod instance has no attribute '_UrlInstallMethod__checkUrlForIsoMounts'

["Richard W.M. Jones" <rjones@xxxxxxxxxx>]

I'm trying to install Rawhide from 
http://www.mirrorservice.org/sites/download.fedora.redhat.com/pub/fedora/linux/development/i386/os/ 
but I just get the following error, whether I try a graphical or text 
install:

Traceback (most recent call last):
File "/usr/bin/anaconda", line 860, in <module>
  anaconda.setMethod(instClass)
File "/usr/bin/anaconda", line 524, in setMethod
  self.method = apply(m, (self.methodstr, self.rootPath, self.intf))
File "/usr/lib/anaconda/urlinstall.py", line 247, in __init__
  self.__checkUrlForIsoMounts()
AttributeError: UrlInstallMethod instance has no attribute 
'_UrlInstallMethod__checkUrlForIsoMounts'

(I had to type that in by reading it off the screen - apologies for any 
typos).

Anyone got any ideas what's wrong?

Rich.

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