fix bug in errorHandler

lib/server.js

@@ -67,7 +67,7 @@ server.prototype.rootHandler = function(request, response){
 };
 
 server.prototype.errorHandler = function(error){
-    throw Error("YAPS, HTTP Server Error:", error);
+    throw Error("YAPS, HTTP Server Error:" + error);
 };
 
 server.prototype.registerPlugin = function(plugin_constructor){