Module (was_server) is missing interpreter line

Hi,
I downloaded the ansible-Websphere package into my ansible tower server and tried using the was_server playbook to start my Websphere server but I keep getting the error “module (was_server) is missing interpreter line” despite I’ve already set the ansible_library to the path where the Websphere playbooks are kept
“ANSIBLE_LIBRARY“: “/var/lib/awx/projects/ansible-websphere/library”

I’m very new to ansible, can anyone please tell me how to fix this error?

Thank you.