The reason why you hitting this error most likely is because you have enabled cache on your site, so once it cached those login token on your site, it will show this invalid token when someone trying to login on your site.

Can you try temporary disable your Joomla cache and see how it goes?

By the way, I was unable to login from your backend.

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Hello,
now i've enabled you,
the problem is that the plug in yesterday installed "jch optimezer" to unload everything, es mobile does not work, and i do not know what else..thought, i should restore the last backup ....

I disable the "System - Page Cache" plugin and everything works fine ...
you are always the best thank you:D

it would be best if you can install back your JCH plugin into your site so we can better have a check.

The most recent request was denied because it contained an invalid security token. Please refresh the page and try again.

Regarding with your first issue, i believe that is common error in Joomla, as long as you enable "System - page cache" plugin, it will try to cache your page HTML code even that login token also will cached.

So now i exclude your hompage menu item into this "System - page cache" plugin, it should work fine now.

Hello
Thank you , .
As far as the plugin I can do without it, if you need it to check for any conflicts I install it so you can check it out?

Yes, since you report when enable JCH plugin, that mobile web template doesn't work right?

Perhaps you can elaborate more details which part not working.

Hello
I tried to enable the cache as you say but the result is the same it appears the invalid token message and es mobile does not work ..

hi ,
i istalled the plugin "JCH Optimize " now is disable , yuo can check it

I tried to enable the cache as you say but the result is the same it appears the invalid token message and es mobile does not work ..

It seems like i also hitting this issue even i excluded your homepage menu item from that plugin.
For now I've temporary disable this cache plugin since it always cached those login token on the page, this is what i referring that login token http://take.ms/mu4Vm .

Perhaps you can consider change to use pagespeed to optimise your site from your server, it's actually an apache / nginx module that can be used to compress and minify a page on the web server's layer without compromising performance of php, so it will improve your site performance faster as well.

Then enabled Gzip compression from backend, it will reduces/optimise for those site image, javascript and css resources file size on your site.

You can read more about mod_pagespeed from https://developers.google.com/speed/pagespeed/module/

Hope this suggestion will help.

i istalled the plugin "JCH Optimize " now is disable , yuo can check it

It seems work fine for me when i enabled it, perhaps you can clear your browser cache and see how it goes?

thank you very much arlex

You are most welcome.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.