The Message Private module provides a message type and associated entity reference fields, enabling sending and receiving private messages using The Message Stack.
Module configuration seems to hang around in active config.
The following extensions will be enabled: message_private Do you really want to continue? (y/n): y exception 'Drupal\Core\Config\PreExistingConfigException' with message 'Configuration objects [error] (message.private_message.field_message_private_body, message.private_message.field_message_private_subject, message.private_message.field_message_private_to_user, message.type.private_message, user.user.field_message_private_usr_notify, views.view.message_private) provided by message_private already exist in active configuration' in /Applications/MAMP/htdocs/drupal-8/core/lib/Drupal/Core/Config/PreExistingConfigException.php:65
Module configuration seems to hang around in active config.
The following extensions will be enabled: message_private Do you really want to continue? (y/n): y exception 'Drupal\Core\Config\PreExistingConfigException' with message 'Configuration objects [error] (message.private_message.field_message_private_body, message.private_message.field_message_private_subject, message.private_message.field_message_private_to_user, message.type.private_message, user.user.field_message_private_usr_notify, views.view.message_private) provided by message_private already exist in active configuration' in /Applications/MAMP/htdocs/drupal-8/core/lib/Drupal/Core/Config/PreExistingConfigException.php:65