free.fr is a popular french hosting provider, giving away free hosting plans. Unfortnately free.fr cripples their PHP configuration beyond anything that can be supported by DokuWiki.
DokuWiki will not run on free.fr out of the box.
We recommend using alternative hosters like byethost.com
Please do not report any bugs regarding running DokuWiki on free.fr before making sure that they still exist when using a different provider.
Some people had success with changing parts of DokuWiki to work around some limitations of free.fr. More info about this can be found in these forum threads:
A list of websites on Free.Fr which run DokuWiki, successfully, is collected here.
The most serious, currently unsolved limitation of patched DokuWiki 2009-02-14 on Free.Fr is, that the media manager of DokuWiki corrupts “big” media files during loading, see here. No verification of this bug for patched DokuWiki 2008-05-05 so far.