Permitted error for snap invoking the other snap

According the example https://github.com/MetaMask/snaps/tree/main/packages/examples/packages/invoke-snap
, I wrote two snaps:
snapA: local:http://localhost:8080
snapB: local:http://localhost:8081

snapA invoke snapB, but there is the permitted error. Are there some other configures?

Start with the packages/examples/packages/invoke-snap example and reproduce the setup using snapA at localhost:8080 and snapB at localhost:8081. Inspect the permitted error and the example's configuration to determine what is missing; done means snapA can invoke snapB without that error.

Written by the indexing model from the issue text.