An RPC call to deliver notifications to the target server failed. Target server: %1 Cause: Check if the target server specified ...

An RPC call to deliver notifications to the target server failed.

Target server: %1
Cause: Check if the target server specified in the description is not started.
Resolution:
This might happen if the target server is down or if a new version of the product was installed. If it is the latter, then ensure that all servers in the pool are running the same version.