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I am getting this error message in the logs after installing RNG module for Drupal 8 and trying to submit a completed a event form. The error log contains this error.

Uncaught PHP Exception Drupal\Core\Entity\EntityStorageException: "Value is not a valid entity." at /home/vhosts/***********/public_html/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php line 757, referer: http://**********/node/add/event_1

Any idea on how I can resolve this please?

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I eventually traced back the issue as being caused by the rules module not RNG. Removing the rules enabled me to save the event.

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