not work any SEO plugin

Hello,
I made a esearch in the forum but I could not solve my problem.

I initially used WP SEO by Yoast without problems but after an update of the template can not seem to use it more.
If active the plugin “disappear” all the admin panel, I see a blank page.
I have tried other SEO plugin but I have the same problem.

This is the site http://redsrl.net/home/

I checked the forum and I see that Yoast is cited as a plugin compatible, but I have this problem.

I am using the following versions:
WP SEO Yoast 1.5.3.2
Enfold 2.8

thank you in advance if you can solve my problem