I’m trying to migrate a Drupal 6 site to Drupal 9. The problem is that when I try to run the migration I get a lot of errors as if Drupal try to use the Drupal 7 migration plugins instead of the Drupal 6 migration plugins.
I get these messages.
Field discovery failed for Drupal core version 7.
TypeError: in_array(): Argument #2 ($haystack) must be of type array, string given en in_array() (líne 106 of /var/www/html/web/core/modules/node/src/Plugin/migrate/source/d7/NodeType.php)
How I can tell Drupal to use the Drupal 6 plugins for the migration?