Whatever you have done has not fixed this issue.
Now I'm getting:
Unable to find configuration file config_form.yaml defined for Backend\Behaviors\FormController.
/nfs/c12/h08/mnt/id/domains/domainname/html/modules/system/traits/ConfigMaker.php line 63
Is this because of Caps used on foldernames too? Sorry to be a pain but I'd paid for this plugin in order to save time.... I would like it to work.