I have solved my problem, by first upgrading to the last nwiki for 1.6.x wiki_rev2007051801 for moodle 1.6.x
then I upgrade moodle to 1.8, and then to 1.9 and the wiki upgrade
works !
Marc
Wiki
Problem upgrading NWIKI from moodle 1.6.5 to 1.8
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