Use the make-error package.

package.json

@@ -60,6 +60,7 @@
     "lodash.pluck": "^2.4.1",
     "lodash.values": "^2.4.1",
     "lodash.where": "^2.4.1",
+    "make-error": "^0.2.0",
     "nconf": "~0.6.9",
     "require-tree": "~0.3.3",
     "schema-inspector": "^1.4.8",

src/api-errors.js

@@ -5,7 +5,7 @@
 var assign = require('lodash.assign');
 var JsonRpcError = require('json-rpc/errors').JsonRpcError;
 var jsonRpcErrors = require('json-rpc/errors');
-var makeError = require('json-rpc/make-error');
+var makeError = require('make-error');
 
 //====================================================================