i can´t do anything on my website

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I can not change anything, add new content on my website. I get the following message:
"Not Acceptable An appropriate representation of the requested resource /index.php could not be found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.".
I need help.

 
Mnkras replied on at Permalink Reply
Mnkras
mod_security on your server was probably updated.

try adding this to your .htaccess:

<IfModule mod_security.c>
   # Turn off mod_security filtering.
   SecFilterEngine Off
   # The below probably isn't needed, but better safe than sorry.
   SecFilterScanPOST Off
</IfModule>

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