--- a/server/core.c	2013/07/24 09:49:38	1506473

+++ b/server/core.c	2013/07/24 09:51:14	1506474

@@ -1481,7 +1481,9 @@

             conf->ap_document_root = arg;

         }

         else {

-            return "DocumentRoot must be a directory";

+            return apr_psprintf(cmd->pool, 

+                                "DocumentRoot '%s' is not a directory, or is not readable",

+                                arg);

         }

     }

     return NULL;