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Same happened to me. On installing new test CiviCRM under WordPress. The "CiviCRM Contribution Page Widget" plugin caused same error. Civi 5.27.1, WP 5.4.2, php 7.2.24 on ubuntu 20.04 LTS


It's found in civicrm.settings.php and will be generated by the installer (or set manually depending on how your CiviCRM instance was configured). You're looking for a line that looks like this: define( 'CIVICRM_SITE_KEY', "");

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