diff --git a/waypoint_manager/scripts/manager_GUI.py b/waypoint_manager/scripts/manager_GUI.py
index eaf7390..87161ed 100755
--- a/waypoint_manager/scripts/manager_GUI.py
+++ b/waypoint_manager/scripts/manager_GUI.py
@@ -131,7 +131,11 @@
 
         with open(map_path) as file:   # .yamlを読み込む
             map_yaml = ruamel.yaml.YAML().load(file)
+        if  not "image" in map_yaml.keys():
+            self.message("Selected map file is unexpected format.")
+            return
         self.mymap = MyMap(Path(map_path), map_yaml)
+        self.message("Read map file " + map_path)
         ## キャンバスサイズに合わせて画像を表示
         scale = 1
         offset_x = 0
@@ -153,7 +157,6 @@
             self.master.title(self.waypoints_filepath.name + " - " + Path(map_path).name)
         else:
             self.master.title(Path(map_path).name)
-        # self.open_menu.entryconfigure("Map", state=tk.DISABLED)
         self.open_menu.entryconfigure("Waypoints", state=tk.NORMAL)
         if self.waypoints is None:
             self.message("Please open waypoints file ")
@@ -184,11 +187,15 @@
         if not filepath: return
         with open(filepath) as file:
             wp_yaml = ruamel.yaml.YAML().load(file)
+        if (not "waypoints" in wp_yaml.keys()) or (not "finish_pose" in wp_yaml.keys()):
+            self.message("Selected waypoints file is unexpected format.")
+            return
         self.waypoints = WaypointList(wp_yaml)
         self.finish_pose = FinishPose(wp_yaml)
         self.waypoints_filepath = Path(filepath)
         self.plot_waypoints()
         self.master.title(self.waypoints_filepath.name + " - " + self.master.title())
+        self.message("Read waypoints file " + filepath)
         self.file_menu.entryconfigure("Save", state=tk.NORMAL)
         self.file_menu.entryconfigure("Save As", state=tk.NORMAL)
         self.popup_menu.entryconfigure("Add waypoint here", state=tk.NORMAL)