I'm getting the same error message. Looked through the post, but nothing helps. These are siteground templates. I've never had a problem with Siteground before. I have 4 of them. I'm trying to delete 2 of them of which are NOT the default template.
I'm going to Extensions > Template Manager > Styles Tab (that may be the problem) > Check the appropriate template box > hit delete and I get the message: Cannot delete last style of a template.
When I go to the Template tab, it shows the pictures of the templates, but I don't see anywhere to actually delete them from the Template tab
I would think that would be the appropriate place, not the Styles Tab.
Edit: I thought I was posting in a thread where this issue was being discussed, but I had to log in first. Then when I logged in, it took me to the "previous page" and a blank post. I posted, but now I see this has been posted as a NEW post.
I'll leave this for now and just note that I had posted it in the "Bug Department" viewtopic.php?f=579&t=521098&p=2587452#p2587452
Maybe someone will have an "easy fix" for this problem. Have never run into this before.
Not sure if it's a bug, a glitch, me, the templates, ?? dunno.