Kafka confluent with docker setup - mongodb connector

I have downloaded confluent platform and setup the docker by using this link https://github.com/confluentinc/cp-all-in-one/blob/7.2.1-post/cp-all-in-one/docker-compose.yml. I have added mongodb connector(all.jar) file inside confluent_hub_components. When I try to connect sink connector it not connecting my local mongodb uri. I am getting error unable to connect server. why I am getting this error?, What did I wrong? Error screenshot attached.