"Your HTML Can Not Be Accepted"

This simply means that the template that you are adding or editing has some missing or corrupt coding that Blogger.com can not accept!

Really the only solution is for you to go through the coding of your template and find out why it's not being accepted by Blogger.com!

If you are sure that it's not the template that is causing the problem then you can report the problem that you are having to Blogger.com. You can find the link to reporting your problem to Blogger.com by going to my BX Error Code Blog and clicking on the link that is provided on the right side of the blog.