Child Theme Upload Problem 8.3

Hi,

I watched the child theme tutorial and I believe I’m doing everything as shown in the tutorial correctly but when I go to upload the theme from the admin backend I get this error …

Unpacking the package…
Installing the theme…
The package could not be installed. The style.css stylesheet doesn’t contain a valid theme header.
Theme install failed.

Any help with this would be greatly appreciated.

Thank you.