saguaros
Could you clarify the steps you did to rename template?
Yes.
1) Templates => Templates => "Ja_teline_v Details and Files" => "Copy Template" button.
2) After I enter new template name (just some letters). For example, "abc"
3) Now Templates => Styles. I dublicate new style based on the new "abc" template.
4) I go to MySQL DB (phpMyAdmin) and copy content of the "params" field in the "XXXX_template_styles" table from old place to new style (To not manually configure it again)
5) That's it
And share the credentials of your site + share the URL that you face 500 error message so I can check for you
I'm back to the original template for now. Therefore, there is no error. If necessary, I can return it and show it to you again. Can I give my credentials right here on the forum?