Greengrass local IPC Pub/Sub issue

[Raghul130]

Hi
I configured an embedded linux device as a greengrass core device with Nucleus(2.14.3) installed. I need to test local IPC Pub/Sub between components. I have cloned CPP-SDK-v2 and built the libs required. From the source https://docs.aws.amazon.com/greengrass/v2/developerguide/interprocess-communication.html followed the steps and when I deploy and run the component I keep getting the error Failed to establish connection with error EVENT_STREAM_RPC_NULL_PARAMETER or Failed to establish connection with error EVENT_STREAM_RPC_CONNECTION_ACCESS_DENIED.
com.example.PubSubPublisherCpp-1.0.0.json