Hello Brian. Thanks for answering
The version I am using of the templates is this:
and Joomla is in version 3.8.5
The administrator has not made changes that I know, however I will consult.
Effectively there were changes in the security of the servers that I have contracted so the administrator of the service enabled the extension base64_decode ()
Now every time I raise a site with Joomla with this server I have to communicate with them to enable this extension.
Thank you very much Brian for your attention