undef error while upgrading bugzilla to the latest version 4.0

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undef error while upgrading bugzilla to the latest version 4.0

midhung
While upgrading bugzilla from 2.23 to 4 version, I am getting the following error message:-

undef error - The 'name' parameter (undef) to DateTime::TimeZone::new was an 'undef', which is not one of the allowed types: scalar at C:/Perl/site/lib/DateTime/TimeZone.pm line 35 DateTime::TimeZone::new(undef, 'name', undef) called at Bugzilla/User.pm line 391 Bugzilla::User::timezone('Bugzilla::User=HASH(0x2df7dbc)') called at Bugzilla/Util.pm line 477 Bugzilla::Util::datetime_from('Fri Mar 11 09:43:45 2011', undef) called at Bugzilla/Util.pm line 433 Bugzilla::Util::format_time('Fri Mar 11 09:43:45 2011', '%a %b %e %Y %T %Z', undef) called at Bugzilla/Template.pm line 619 Bugzilla::Template::__ANON__('Fri Mar 11 09:43:45 2011') called at template\en\default\list\list.html.tmpl line 72 eval {...} called at template\en\default\list\list.html.tmpl line 18 Template::Provider::__ANON__('Bugzilla::Template::Context=HASH(0x3a841f8)') called at C:/Perl/site/lib/Template/Document.pm line 151 eval {...} called at C:/Perl/site/lib/Template/Document.pm line 149 Template::Document::process('Template::Document=HASH(0x3a9e604)', 'Bugzilla::Template::Context=HASH(0x3a841f8)') called at C:/Perl/site/lib/Template/Context.pm line 351 eval {...} called at C:/Perl/site/lib/Template/Context.pm line 321 Template::Context::process('Bugzilla::Template::Context=HASH(0x3a841f8)', 'Template::Document=HASH(0x3a9e604)') called at Bugzilla/Template/Context.pm line 45 Bugzilla::Template::Context::process('Bugzilla::Template::Context=HASH(0x3a841f8)', 'Template::Document=HASH(0x3a9e604)') called at C:/Perl/site/lib/Template/Service.pm line 94 eval {...} called at C:/Perl/site/lib/Template/Service.pm line 91 Template::Service::process('Template::Service=HASH(0x39ac03c)', 'list/list.html.tmpl', 'HASH(0x19d4b44)') called at C:/Perl/site/lib/Template.pm line 66 Template::process('Bugzilla::Template=HASH(0x3983854)', 'list/list.html.tmpl', 'HASH(0x19d4b44)') called at D:/Apache/htdocs/bugzilla/buglist.cgi line 1249

Any thoughts?