Themes Won’t Load to Themes Page

1. On my blog at https://www.jamesmpalmer.com/index, which is a subdomain, I can’t get themes to load. Whenever I try I get this error message on my Themes page:

Broken Themes
The following themes are installed but incomplete. Themes must have a stylesheet and a template.
Name Description
Stylesheet is missing.

It doesn’t matter which one I load, or how many I load, all I get is this one error message. I can’t remove the message by deleting the theme either. This isn’t a problem with my main domain’s blog (though that one has bigger problems right now). Can anyone help me? Please email me at [email protected] with suggestions.
Thanks