diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index f4f44f8010..0c752c0fa7 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -745,7 +745,19 @@ module Test
             end
             unless error.empty?
               puts "\n""Retrying hung up testcases..."
-              error.map! {|r| ::Object.const_get(r[:testcase])}
+              error = error.map do |r|
+                begin
+                  ::Object.const_get(r[:testcase])
+                rescue NameError
+                  # testcase doesn't specify the correct case, so show `r` for information
+                  require 'pp'
+
+                  $stderr.puts "Retrying is failed because the file and testcase is not consistent:"
+                  PP.pp r, $stderr
+                  @errors += 1
+                  nil
+                end
+              end.compact
               verbose = @verbose
               job_status = options[:job_status]
               options[:verbose] = @verbose = true