Importing Yaml Swagger gives Path parameter error.

I checked that my yaml file is valid using swagger and i can import it to postman without error but in SOAPUI pro if i import my yaml file, i get an error: 

 

attribute paths.'/System/DocumentCategories/{CategoryCode}'. Declared path parameter CategoryCode needs to be defined as a path parameter in path or operation level

I have attached my yaml file.

 

it looks like $ref is not parsed properly.