During the cleanup phase of installation, I am obtaining the following error. This is a fresh installation on a machine. I am a beginner with Linux and Drupal so any help is appreciated.

Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/html/includes/entity.inc).

Unknown data property og_group_ref.

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jdobre created an issue.