diff --git a/src/module/_error.js b/src/module/_error.js
new file mode 100644
index 0000000..35e7dec
--- /dev/null
+++ b/src/module/_error.js
@@ -0,0 +1,12 @@
+function _error(code, result) {
+	if (code === 'http') {
+		return result.exception || result.textStatus
+	} else if (code === 'okay-but-empty') {
+		return result
+	}
+	return result.errors[0].html
+}
+
+module.exports = {
+	_error,
+}