If you get “method not implemented” error  message, it is most likely your httpd server is using mod_security. You can completely remove mod_security from your site or your httpd server.

To remove mod_security from your site, edit .htaccess file:
add these lines:

<IfModule mod_security.c>
###########################################
# disable POST processing to not break multiple image upload

    SecFilterEngine Off
    SecFilterScanPOST Off
</IfModule>

<IfModule mod_deflate.c>

If this does not work, remove mod_security from your httpd.conf by commenting out the following lines:

AddModule mod_security.c
LoadModule security_module modules/mod_security.so
Include “/usr/local/apache/conf/modsec.conf”

 Or move mod_security.conf from conf.d directory to somewhere else.