Thrown by NatsBroker.connect when the JetStream stream could
not be ensured: the stream is absent and NatsOptions.streamSubjects was
not supplied, or the platform refused the stream read/create. The platform's
own error is carried as cause when there is one.
The message names both remedies: create the stream out of band (for example
nats stream add <name>), or supply NatsOptions.streamSubjects so the
broker can create it with explicit subjects. The broker deliberately sends
no catch-all subject: NATS refuses subjects: ['>'] without no_ack, and
with no_ack every publish would reject unobserved — so a subject set must
come from the application.
Creates the error reported when the stream could not be ensured.
stream: string
The stream name the broker tried to ensure.