Hi all.
I got this strange situation which seems like a bug to me: went to duplicate a page template and gave it a new name and identifier and it went okay. However, after editing the new/copied template and tried to apply the changes it shows an error message like in the image below.
I tried changing the name and could save it but then next time I tried to change and save it I got the same error message.
Am I doing something wrong or is this a bug?
Thanks in advance.