Fixed invalid sort mode given bug

file_system.go

@@ -2453,12 +2453,7 @@ func system_fs_handleList(w http.ResponseWriter, r *http.Request) {
 	}
 	//Commented this line to handle dirname that contains "+" sign
 	//currentDir, _ = url.QueryUnescape(currentDir)
-	sortMode, err := utils.PostPara(r, "sort")
-	if err != nil {
-		utils.SendErrorResponse(w, err.Error())
-		return
-	}
-
+	sortMode, _ := utils.PostPara(r, "sort")
 	showHidden, _ := utils.PostPara(r, "showHidden")
 
 	userinfo, err := userHandler.GetUserInfoFromRequest(w, r)