It happened what I had fear that happened.
https://www.dropbox.com/s/q8ayjx9za8i0nhh/Screenshot%202017-05-12%2018.48.22.png?dl=0
Since we don’t have access.
Can you login in your server and rename the uplift-child directory name to uplift-child-old that is located at wp-content/themes so that the child theme will be inactive with this name change.
Then login in the admin area, after getting in you can revert the child theme directory name to the original one.
Will try the plugin in my dev site instead trying in yours.
-Rui