The default configuration line "Plugins.Redis.Uri=tcp://localhost:6379" deemed incorrect

On zabbix-agent2, when I only uncomment the provided line from the default config:

Plugins.Redis.Uri=tcp://localhost:6379

zabbix-agent2 does not start with the message:

zabbix_agent2 [6152]: ERROR: cannot create scheduling manager: invalid plugin Redis configuration: Cannot assign configuration: invalid parameter Plugins.Redis.Uri at line 32: unknown parameter

Of course I tried other hostnames instead of "localhost" with the same result.

*Expected result: *

zabbix-agent2 should start and begin monitoring a Redis server at localhost:6379 or some other host:port