Migrating fails without any error

I’m trying to run a migration D7 to D8 which I’ve coded. This is the command:

drush migrate-manifest manifest.yml --legacy-db-url=mysql://User:PASSW@localhost/drupal7ddbb --verbose

but basically no response, just something like done… but there is no nodes in the list of content.

Anyone knows how to make a deeper debug in Drupal8 migrations?

Thanks in advance.