Hotel-reservations load test problem

[violector]

Hello！When I tested the second-level service of the hotel reservations, I found that I could not access the second-level service, whether using locust or the loadtest service in your code, the test using locust showed rpc error: code = Unavailable desc = there is no address available, using your load-test shows a connection error of 500, I would like to ask you how to test the second-level service