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When I go to Admin/Structure/Pages, the following error occurs:
InvalidArgumentException: The internal path component 'https://dssm.vegas/civicrm/contribute/transact' is external. You are not allowed to specify an external URL together with internal:/. in Drupal\Core\Url::fromInternalUri() (line 420 of core/lib/Drupal/Core/Url.php).
I either need assistance in removing the error or instruction as to where I can delete the latest page I tried to add to the site without this interface.
After a backup of the database...
First, I searched the MySQL database for records that had both "contribute" & "transact".
Next: Suspecting the drpl_router table, I found one of the two entries, one with "page_manager" in it and the name of the form created before the crash. Deleted that record. Found similar in the drpl_config table and deleted that.
Reloaded the page, went back to Admin/Structure/Pages and was able to load the page manager.
Hope this helps someone.
SELECT MAX(nid) FROM node;to get the ID of the page you added most recently. If you then go to yoursite.com/node/ID/edit it will open the page in the page editor, and a delete link will be available at the bottom of the form.