Fatal error: Call to a member function getExecutable() on null in /drupal-8.1.8/modules/contrib/entity_browser/src/Plugin/EntityBrowser/Widget/View.php on line 98
Can you check your on manage form display if you have "No entity browser selected." ? If yes get rid of it by clicking on the settings icon, configure it and save it back.
Fatal error: Call to a member function getExecutable() on null in /drupal-8.1.8/modules/contrib/entity_browser/src/Plugin/EntityBrowser/Widget/View.php on line 98