我从redmine 1.1升级到1.2之后收到以下警告：
remote: redmine/vendor/plugins/rfpdf/lib/fpdf/chinese.rb:49: warning: already initialized constant Big5_widths
remote: redmine/vendor/plugins/rfpdf/lib/fpdf/chinese.rb:60: warning:already initialized constant GB_widths
remote: redmine/vendor/plugins/rfpdf/lib/fpdf/japanese.rb:49: warning: already initialized constant SJIS_widths
remote: redmine/vendor/plugins/rfpdf/lib/fpdf/korean.rb:49: warning: already initialized constant UHC_widths