ZK_HOSTS...Invalid hostname

[#1]

Receiving below error when trying to install Zookeeper and Casandra.

Error: Validating setup variables Checking for required variables Checking required variable ZK_HOSTS...Invalid hostname Checking required variable HOSTIP...Unknown Checking required variable RUN_USER...OK Checking required variable RUN_GROUP...OK Error: setup.sh: /apigee4/apigee/apigee-service/bin/apigee-service exited with unexpected status 1

Verified response.txt and also hostname -i is working fine.

Anything else need to validated.

Thanks in Advance!