added whole system from ola4doc

sys/node_modules/har-validator/src/error.js

@@ -0,0 +1,15 @@
+export default function HARError (errors) {
+  let message = 'validation failed'
+
+  this.name = 'HARError'
+  this.message = message
+  this.errors = errors
+
+  if (typeof Error.captureStackTrace === 'function') {
+    Error.captureStackTrace(this, this.constructor)
+  } else {
+    this.stack = (new Error(message)).stack
+  }
+}
+
+HARError.prototype = Error.prototype