diff --git a/loopback/server/middleware/error-handler.js b/loopback/server/middleware/error-handler.js
index e274396a65..10c0bc6350 100644
--- a/loopback/server/middleware/error-handler.js
+++ b/loopback/server/middleware/error-handler.js
@@ -1,12 +1,13 @@
 
-const UserError = require('../../util/user-error');
+const UserError = require('vn-loopback/util/user-error');
 const logToConsole = require('strong-error-handler/lib/logger');
 const valueIsNot = require('./value-is-not');
 const valueInvalid = require('./value-invalid');
-
+const mapMethods = require('vn-loopback/util/map-methods')
 const validations = [
     valueIsNot,
-    valueInvalid
+    valueInvalid,
+    mapMethods
 ];
 module.exports = function() {
     return function(err, req, res, next) {
diff --git a/loopback/util/map-methods.js b/loopback/util/map-methods.js
new file mode 100644
index 0000000000..2858cd61da
--- /dev/null
+++ b/loopback/util/map-methods.js
@@ -0,0 +1,12 @@
+const SLASH = '/';
+const MODULES = 'modules';
+const BACK = 'back';
+
+const app = require('vn-loopback/server/server');
+
+const modelsMethods = app;
+function keyMap(model, local, connector = '_') {
+    return `${model}${connector}${local}`;
+}
+module.exports = modelsMethods;
+