Drupal: How to troubleshoot entity error?

Drupal: How to troubleshoot entity error? Helpful? Please support me on Patreon: With thanks praise to God and with thanks to the many people who have made this project possible! Content except music images licensed under CC BY-SA Music: Images: others With thanks to user Charles Letcher drupal.stackexchange.comusers98538 user berramou drupal.stackexchange.comusers84694 user 4k4 drupal.stackexchange.comusers47547 and the Stack Exchange Network drupal.stackexchange.comquestions293180.
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