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+When doing `ikiwiki --setup mysite.setup`, I got the following error
+
+```
+build Ikiwiki instance...
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+generating wrappers..
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 593.
+successfully generated /home/lumeng/public_html/wolfram-pages/ikiwiki.cgi
+rebuilding wiki..
+skipping bad filename build/known_hosts~
+skipping bad filename build/config~
+```
+
+Any idea how to fix it?
+
+Ubuntu, ikiwiki version 3.20130904.1ubuntu1.