diff --git a/src/main.rs b/src/main.rs
index 3bffc4b..204b252 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -45,7 +45,7 @@ fn main() {
         pattern = res.unwrap();
     }
     else {
-        println!("ret err {:?}", res);
+        println!("ret err {:?}", res.err());
     }
 
     //pattern management