Export Swagger/OpenAPI not working because endpoints

Currently, I have several APIs created for a project and want to export this file as yaml or json to import it in SwaggerHub. However, when I try to save the file and click on OK, I'm getting the following error: ReadyAPI error I have set several environments for the developed APIs as configured environments so I don't really know whats going on. Endpoints

Please, may I have some help? Kind thank you in advance.