Cannot determine Zone: set in this resource, or set provider-level zone

[ibreakthecloud]

Upon running docker run for GCE, following error occurs:

4 error(s) occurred:

* module.worker.google_compute_instance.cncf: 1 error(s) occurred:

* google_compute_instance.cncf: Cannot determine zone: set in this resource, or set provider-level zone.
* module.master.google_compute_instance.cncf[1]: 1 error(s) occurred:

* google_compute_instance.cncf.1: Cannot determine zone: set in this resource, or set provider-level zone.
* module.master.google_compute_instance.cncf[2]: 1 error(s) occurred:

* google_compute_instance.cncf.2: Cannot determine zone: set in this resource, or set provider-level zone.
* module.master.google_compute_instance.cncf[0]: 1 error(s) occurred:

* google_compute_instance.cncf.0: Cannot determine zone: set in this resource, or set provider-level zone.

[ibreakthecloud]

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