This support ticket is created 5 years, 1 month ago. There's a good chance that you are reading advice that it now obsolete.
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Plugin Name: Toolset Layouts Migration
Current Plugin Version: 1.0
Last Updated: 03/16/2017
Details: It was last updated 2 years 6 months ago and tested up to WordPress 5.1.1. It may have compatibility problems with the current version of WordPress or unknown security issues. Get more information.
Plugin URL: https://toolset.com
Plugin Name: Toolset Advanced Export
Current Plugin Version: 1.0
Last Updated: 01/24/2017
Details: It was last updated 2 years 8 months ago and tested up to WordPress 5.1.1. It may have compatibility problems with the current version of WordPress or unknown security issues. Get more information.
Plugin URL: https://toolset.com
You should go to your Plugins page and click of the "Registered" link available with the Toolset Types plugin and from there you should update your plugins.
I did the steps you gave me - even to the point of adding the WS-CONFIG line with my key and I still get this error when I try the step shown in the attached image.
Thats really strange. Can you please share access details.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.