Lab: Session Persistence scirpt not working

We have created a script that sets up the infrastructure for you. Please navigate to the /root directory and run the script named infra.sh. Wait for a while until the script completes the infrastructure setup.

but its script not working.

Creating NIC named webserver-0{1…2}-nic for VM named webserver-0{1…2}…

(InvalidResourceName) Resource name webserver-0{1…2}-nic is invalid. The name can be up to 80 characters long. It must begin with a word character, and it must end with a word character or with ‘'. The name may contain word characters or ‘.’, ‘-’, '’.
Code: InvalidResourceName
Message: Resource name webserver-0{1…2}-nic is invalid. The name can be up to 80 characters long. It must begin with a word character, and it must end with a word character or with ‘'. The name may contain word characters or ‘.’, ‘-’, '’.
Failed to create NIC