I am running Drupal 8.3.3 multisite. One of the sites has a problem that was first intermittent but then always. The nginx error below:
2017/05/13 08:36:40 [error] 960#0: *4817 FastCGI sent in stderr: “PHP message: Uncaught PHP Exception InvalidArgumentException: "Field is unknown.” at /var/www/html/drupal/core/lib/Drupal/Core/Entity/ContentEntityBase.php line 509" while reading response header from upstream, client: 220.127.116.11, server: , request: “GET / HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php5-fpm.sock:”, host: “www.archiveofdisability.org”
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.