Integration error message when created API auto mocking

Hello team, 

I'm trying to create API Auto Mocking in SwaggerHub but I still got integration error message with " Could not generate API mock. Please make sure the API definition is valid ", even on my swagger UI show no error, my definition is valid and I got a server URL. When I try it out, the response status is 404 not found. 

Here is my API https://app.swaggerhub.com/apis/Loempisey/SAMPLE_API/1.0.0#/Administation%20by%20admin%20code.

I hope you will take a look and determine what is causing the problem.

Thanks inadvance.