Sorry but we are not able to edit files via FTP or rename them https://gyazo.com/a6a3951b70e31ea2488b300b0db7bfd3
You have copied a lot of out of date files to your child theme and some of them cause the issue.
Could you, please:
1) Change FTP user permissions to allow us to edit files
2) Check the files that you have in child theme. Are you sure that all the files that you copied there are necessary? Did you make changes in all files of your child theme and subfolders?
