Coursera Postman returns fault. Course 2 Lab: Test Your Proxy

[#1]

I am going trough Coursera course for ApiGee.
In the second lab of course 2 when I execute the GET/products/{id}
in response I get:

{

"fault": {

"faultstring": "The Service is temporarily unavailable",

"detail": {

"errorcode": "messaging.adaptors.http.flow.NoActiveTargets"

}

}

}
Could someone help me understand where I could have an mistake?