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CSV migration always returns "id is defined as a source ID but has no value"

I have a freshly composer installed Drupal 8.6.13. I tried to migrate csv sources and allways got the error message

[error] Migration failed with source plugin exception: id is defined as a source ID but has no value.

I switched to an example that is running in another installation https://www.drupal.org/docs/8/api/migrate-api/migrate-source-plugins/migrating-data-from-a-csv-source, but still get this error.

My versions: migrate 8.6.13, migrate_plus 8.x-4.1, migrate_source_csv 8.x-2.2, migrate_tools 8.x-4.1

Does anyone have an idea what causes the error?

This are the files:

CSV:

id,title,body  1,title 1,some body text 1  2,title 2,some body text 2  3,title 3,some body text 3

Migration configuration:

id: article_csv_import label: Import articles migration_groups:   - ACME import source:   plugin: csv   path: 'public://articles.csv'   delimiter: ','   enclosure: '"'   header_row_count: 1   keys:     - id   column_names:     0:       id: 'Unique Id'     1:       title: 'Title'     2:       body: 'Post body' process:   title: title   body: body   type:     plugin: default_value     default_value: article  destination:   plugin: entity:node
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CSV migration always returns "id is defined as a source ID but has no value"

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