Please make sure every required option is configured in options (See options.swaggerImport in the options object). Afterwards you can start the server, open the "swagger import" modal and click run import. After a few seconds the swagger import should be completed. Now reload the UI and check the new available API endpoints and DTO's.
It's recommended to run the "validate all" script before running the "swagger import". After a successful import run the "validate all" script again. It seems the API has an breaking change since last import, if something is not valid.
After an "swagger import" you will find a bunch of mock-functions, if "options.swaggerImport.responseFuncPath" is defined. These "mock-functions" will be overwritten for each import, to make sure you can use them please copy the needed ones into your usual "mock-function" (options.funcPath) directory. Which means you shouldn't add the "options.swaggerImport.responseFuncPath" to the "options.funcPath" to prevent conflicts.
If you are behind a corporate proxy and want to reach an external swagger, you can configure a http-proxy-agent (see options.agent in the options object and a usage example).