WSOD in opensocial with RNG - related to translation modules

[rudydehaas]

hi:
I loaded a new opensocial site (debian, apache2, PHP 7.2, mardiadb) using composer, then added all RNG modules and enabled almost everything including language translation. Following instructions in RNG quick start seemed ok until save on "crate an event" step - then White screen of death. Log message is ...

http://localhost/node/add/event_1

http://localhost/node/add/event_1
Drupal\Core\Entity\EntityStorageException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'content_translation_source' in 'field list': INSERT INTO {node_field_data} (nid, vid, type, langcode, status, title, uid, created, changed, promote, sticky, default_langcode, revision_translation_affected, content_translation_source, content_translation_outdated) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12, :db_insert_placeholder_13, :db_insert_placeholder_14); Array ( [:db_insert_placeholder_0] => 29 [:db_insert_placeholder_1] => 29 [:db_insert_placeholder_2] => event_1 [:db_insert_placeholder_3] => en [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => New Event [:db_insert_placeholder_6] => 1 [:db_insert_placeholder_7] => 1549479060 [:db_insert_placeholder_8] => 1549479213 [:db_insert_placeholder_9] => 0 [:db_insert_placeholder_10] => 0 [:db_insert_placeholder_11] => 1 [:db_insert_placeholder_12] => 1 [:db_insert_placeholder_13] => und [:db_insert_placeholder_14] => 0 ) in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 783 of /var/www/exforkar/html/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).

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De-installed all language translation modules - problem disappears and RNG System works as expected.

Unfortunately.. I need English, French, Japanese, and (possibly) spanish.

Any suggestions?