diff --git a/app/models/grader_configuration.rb b/app/models/grader_configuration.rb
--- a/app/models/grader_configuration.rb
+++ b/app/models/grader_configuration.rb
@@ -152,7 +152,7 @@
 
   def self.read_config
     GraderConfiguration.config_cache = {}
-    GraderConfiguration.find(:all).each do |conf|
+    GraderConfiguration.all.each do |conf|
       key = conf.key
       val = conf.value
       GraderConfiguration.config_cache[key] = GraderConfiguration.convert_type(val,conf.value_type)