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Programmatically create media file

I am attempting to programmatically create a media file. This is what I bought thus far:

$file_data = file_get_contents('http://www.africau.edu/pictures/default/pattern.pdf');  $file = file_save_data($file_data, 'public://3010.pdf', FILE_EXISTS_REPLACE);  $media = Media::create([   'bundle' => 'file',   'uid' => '0',   'field_media_file' => [     'target_id' => $file->id(),   ], ]);  $media->setName('Hey')   ->setPublished(TRUE)   ->save();

Sadly this returns me Drupal Developer following error and Drupal Developer media file would not get saved:

Error: Name to a member perform getSource() on null in DrupalmediaEntityMedia->getSource() (line 138 of core/modules/media/src/Entity/Media.php).

What am I doing mistaken? How can I repair this error?

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Programmatically create media file

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