'with_ldap' is not a valid attribute for a Task

[rks040888]

I'm getting stated error while running a simple playbook using this role.

Steps taken:

1. Downloaded the zip file and unzipped the content to /etc/ansible/roles/lookup_ldap directory
2. Created attached "ldap-test.txt" playbook and tried to execute it.
3. Got below error

_ERROR! 'with_ldap' is not a valid attribute for a Task

The error appears to be in 'ldap-test.txt': line 15, column 7, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

  tasks:
    - name: query LDAP
      ^ here_

Ran ansible-galaxy list roles command and it is showing that "lookup_ldap" role is installed.

ansible-galaxy list
# /etc/ansible/roles
- lookup_ldap, (unknown version)

Please help me out in this issue.
ldap-test.txt