Hi Herbert
Thank you for bringing this issue to our attention.
We have just updated the Ensley template, resolving this issue. It seems an error was introduced with the adding of child template support yesterday.
Updating your template to the latest download should resolve this issue for you. For details on updating your template may I suggest the following article..
https://joomla51.com/tutorials/joomla-basics/updating-your-joomla-template
If the issue persists after updating, may I suggest sending temporary administration access to your Joomla installation to info@joomla51.com and we will examine this issue further. For our reference please paste a link to this post in your email.
Ciaran