diff --git a/lib/refrepo/valid/oar-properties.rb b/lib/refrepo/valid/oar-properties.rb
index 4a63bbeb24ae163bfd9d9c6c3c1bcd0c647aad15..d7a04e740907af13766c07326facbadcc336f68a 100644
--- a/lib/refrepo/valid/oar-properties.rb
+++ b/lib/refrepo/valid/oar-properties.rb
@@ -92,7 +92,7 @@ module RefRepo::Valid::OarProperties
         nbcores = nbcores.first
 
         if host_resources.length != nbcores
-          puts "ERROR: invalid number of resources for #{host}. should be nbcores."
+          puts "ERROR: invalid number of resources for #{host}. should be nbcores. (host_resources.length=#{host_resources.length} ; nbcores=#{nbcores})"
           ret = false
         end