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+When doing `ikiwiki --setup mysite.setup`, I got the following error
+
+
+    $ ikiwiki --version
+    ikiwiki version 3.20150107
+    18:04:37 $ ikiwiki --setup mysite.setup
+    build Ikiwiki instance...
+    Use of uninitialized value in string eq at /usr/share/perl5/IkiWiki.pm line 650.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 669.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 669.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 674.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 674.
+    generating wrappers..
+    Use of uninitialized value in string eq at /usr/share/perl5/IkiWiki.pm line 650.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 669.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 669.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 674.
+    Use of uninitialized value in string ne at /usr/share/perl5/IkiWiki.pm line 674.
+    successfully generated /home/qi/public_html/pages/ikiwiki.cgi
+    rebuilding wiki..
+    
+
+Any idea how to fix it?  I'm on Ubuntu.
+
+    $ perl --version
+    
+    This is perl 5, version 18, subversion 2 (v5.18.2) built for x86_64-linux-gnu-thread-multi
+    (with 41 registered patches, see perl -V for more detail)