Why am I getting the following error when I try to upgrade my site from Drupal 7 to 8 using the Migrate Upgrade module? After a progress of 11% my site's throwing an Ajax error:

An AJAX HTTP request terminated abnormally.

Debugging information follows.

Path: /mysite/?q=en/file/ajax/field_slideshow_image/und/form-ESe-qn-oh9D4OVpLClBz2wTv1mHUxaTWHmj2hi5V3aw

StatusText: n/a

ResponseText: The page cannot be displayed because an internal server error has occurred.

ReadyState: undefined

The actual error message is the following:

Source ID comment_node_industry_recognition: Attempt to create a bundle with an ID longer than 32 characters: comment_node_industry_recognition(). (/media/public_html/public_html/drupal/drupalmigrationfinal/‌​core/lib/Drupal/Core‌​/Entity/Entity.php:4‌​08)

closed as off-topic by Kevin, Pierre.Vriens, Neograph734, Shawn Conn, mradcliffe Feb 13 '17 at 22:38

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  • 1
    Report a bug in the core issue queue. This will need to be fixed there. – Berdir Feb 13 '17 at 12:37
  • 4
    This bug should be filed in the core issue queue. – Kevin Feb 13 '17 at 14:40
  • 1
    There actually already is an issue for this: drupal.org/node/2565931 – Mike Ryan Feb 13 '17 at 17:30