/Users/ahiru/mikutter/source/core/mui/gtk_photo_pixbuf.rb:63:in `initialize': ファイル '/Users/ahiru/mikutter/others/Slack_Mark_Web.png' のオープンに失敗しました: No such file or directory
         from /Users/ahiru/mikutter/source/core/mui/gtk_photo_pixbuf.rb:63:in `new'
         from /Users/ahiru/mikutter/source/core/mui/gtk_photo_pixbuf.rb:63:in `pixbuf'
         from /Users/ahiru/mikutter/source/core/mui/gtk_photo_pixbuf.rb:34:in `load_pixbuf'
         from /Users/ahiru/mikutter/source/core/mui/gtk_webicon.rb:40:in `load_model'
         from /Users/ahiru/mikutter/source/core/mui/gtk_webicon.rb:28:in `initialize'
         from /Users/ahiru/mikutter/source/core/plugin/gtk/gtk.rb:513:in `new'
         from /Users/ahiru/mikutter/source/core/plugin/gtk/gtk.rb:513:in `tab_update_icon'
         from /Users/ahiru/mikutter/source/core/plugin/gtk/gtk.rb:284:in `block (2 levels) in <top (required)>'