XDCR replication going on without actually replicating anything

I have configured XDCR from one node of an existing cluster connecting to another node of a new cluster for each buckets separately but nothing is getting replicated to the new node’s buckets.

Configuration:

Getting an error sometime. Error screenshot:
image

The replication is going on for around 8 hours without any data being replicated.

Please let me know where I am getting wrong.