The composer.json file uses a wrong package name: For a Drupal project whose machine name is at_theme, its package name must be drupal/at_theme, not drupal/adaptivetheme, which is the package name of another Drupal project.
Issue fork at_theme-3412902
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Start within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
Comments
Comment #4
sourabhjainComment #5
avpadernoThe MR changes the file as expected.
Comment #6
ccjjmartin commented+1 RTBC, noticed this earlier today.