Update journal_papers_controller.rb

app/controllers/admin/journal_papers_controller.rb

@@ -35,7 +35,7 @@ class Admin::JournalPapersController < OrbitMemberController
         @journals[key] = value.group_by{|v| [get_level_type(v),get_author_type(v),get_paper_type(v),get_publication_date(v)]}
         @journals[key].each do |key1,value1|
           if value1.length==1
-            value.delete key1
+            @journals[key].delete key1
           end
         end
       end