Playbook 3 fails in loop control - Syntax problem

[ryoung1us]

[admin1@controller Ansible-OpenShift-Provisioning]$ ansible-playbook playbooks/3_setup_kvm_host.yaml
ERROR! 'extended_allitems' is not a valid attribute for a LoopControl
The error appears to be in '/home/admin1/ocpauto/Ansible-OpenShift-Provisioning/roles/configure_storage/tasks/main.yaml': line 67, column 5, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
loop_control:
extended: yes
^ here

I commented out extended_allitems, and the playbook no longer had the syntax error.