Exportation .mogrt

Hello, 

I'm a very beginner on AE...

I've got a problem when i want to export a .mogrt template. I've got this error message : 

Graphics templates from After Effect projects is supported. However, we currently do not support XML files or After Effect template files.

I follow this tutorial : https://blog.adobe.com/fr/publish/2017/09/22/creer-des-templates-de-motion-graphics-dans-adobe-after-effects#:~:text=Comment%20cr%C3%A9er%20un%20template%20de%20motion%20graphics%20(.mogrt)&text=Cliquez%20sur%20%C2%AB%20Propri%C3%A9t%C3%A9s%20support%C3%A9es%20en,personne%20qui%20utilisera%20votre%20fichier%20.

Can you help me please ?