diff --git a/MaLiang/Classes/MetalBase/MLError.swift b/MaLiang/Classes/MetalBase/MLError.swift
index 9aa4c99..fd208c6 100644
--- a/MaLiang/Classes/MetalBase/MLError.swift
+++ b/MaLiang/Classes/MetalBase/MLError.swift
@@ -9,6 +9,8 @@ import Foundation
 
 public enum MLError: Error {
     
+    case initializationError
+    
     /// the requested file does not exists
     case fileNotExists(String)