Auto-generated certificates

I am trying to use auto generated tls for my cluster and following the below docs
Configure Network Encryption using Confluent for Kubernetes | Confluent Documentation
I have created the secret and attached the CA cert and key file.
But when I am deploying in my kafka pod is showing the error in the log and not able to start the pod.
org.apache.kafka.common.config.ConfigException: Could not read properties from file /mnt/sslcerts/jksPassword.txt

Any idea or pointers where should I look to find the cause of the issue.