Email template with opt-out URL brings to a blank page with ""

We have an email template that triggers when a contact is added to a particular group. Email gets sent but the token within the template {action.optOutUrl} doesn't work. How to fix it please? I am using CiviCRM 5.11, Civirules 2.5, and Email-Api extension 1.19.

Edited Apr 17, 2019 by tapash

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