diff --git a/Assets/VRMShaders/GLTF/IO/Editor/Texture/Exporter/EditorTextureSerializer.cs b/Assets/VRMShaders/GLTF/IO/Editor/Texture/Exporter/EditorTextureSerializer.cs
index ee0932873..6104064a3 100644
--- a/Assets/VRMShaders/GLTF/IO/Editor/Texture/Exporter/EditorTextureSerializer.cs
+++ b/Assets/VRMShaders/GLTF/IO/Editor/Texture/Exporter/EditorTextureSerializer.cs
@@ -42,7 +42,7 @@ namespace VRMShaders
                     return false;
                 default:
                     // Not Supported TextureImporterType
-                    throw new ArgumentOutOfRangeException();
+                    throw new ArgumentException($"{texture}: textureImporter.textureType {textureImporter.textureType} is not supported. Only Default or NormalMap is supported");
             }
 
             return true;