lib/nanoc/base/errors.rb in nanoc-3.6.9 vs lib/nanoc/base/errors.rb in nanoc-3.6.10

@@ -219,8 +219,17 @@
         super("#{type} #{plural ? 'are' : 'is'} not available yet. You may be missing a Nanoc::Site#load_data call.")
       end
 
     end
 
+    # Error that is raised when multiple items or layouts with the same identifier exist.
+    class DuplicateIdentifier < Generic
+
+      def initialize(identifier, type)
+        super("There are multiple #{type}s with the #{identifier} identifier.")
+      end
+
+    end
+
   end
 
 end