diff --git a/handlers/list.go b/handlers/list.go
index f870806..391ce5d 100644
--- a/handlers/list.go
+++ b/handlers/list.go
@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"encoding/json"
+	"log"
 	"net/http"
 	"time"
 
@@ -20,7 +21,7 @@ func ListFiles(client valkey.Client) http.HandlerFunc {
 
 		expiresInt, err := client.Do(r.Context(), client.B().Ttl().Key(upload_id).Build()).AsInt64()
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusNotFound)
+			http.Error(w, "not found", http.StatusNotFound)
 			return
 		}
 		expiresIn := time.Second * time.Duration(expiresInt)
@@ -29,7 +30,8 @@ func ListFiles(client valkey.Client) http.HandlerFunc {
 		files_json, err := client.Do(r.Context(),
 			client.B().Get().Key(upload_id).Build()).ToString()
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusNotFound)
+			log.Printf("upload_id:'%s' err: %s\n", upload_id, err.Error())
+			http.Error(w, "not found", http.StatusNotFound)
 			return
 		}
 
@@ -37,7 +39,8 @@ func ListFiles(client valkey.Client) http.HandlerFunc {
 
 		err = json.Unmarshal([]byte(files_json), &fileIds)
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
+			log.Printf("upload_id:'%s' err: %s\n", upload_id, err.Error())
+			http.Error(w, "not found", http.StatusInternalServerError)
 			return
 		}