ORA-62748
The BOOTSTRAP_SERVERS parameter is a comma-separated list of 'host:port' values. The supplied value {%0!s} does not contain a 'host:port' pair.
Cause
The bootstrap server list did not contain a 'host:port' pair.
Action
Update the bootstrap server list to contain a 'host:port' pair or a comma-separated list of 'host:port' pairs.