Can't create a new comcode

I am trying to Add Custom Comcode tag, but when I save it I get an error message bellow:

Not Acceptable
An appropriate representation of the requested resource /cp/adminzone/index.php could not be found on this server.
Additionally, a 406 Not Acceptable error was encountered while trying to use an ErrorDocument to handle the request.

If I click on preview, I get this message:

Not Acceptable!
An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

 

Composr Supplementary: ModSecurity

Open Source CMS with advanced social, interactive and dynamic features. Fully flexible, themeable and extendible: suitable for building powerful websites.

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