This is likely to be a problem with your host (most often Hostgator or GoDaddy) but it is easily solved.
Could you please open a support ticket with your hosting company and copy and paste the following in:
"I
have a PHP script that is triggering mod_security as it tries to pass
some data to another script in a querystring. Please could you whitelist
the script in the mod_security settings. The script is in the
xxxxxxxxx directory."
NB: Where I have entered xxxxxxxxxx - replace this with the name of the directory where you have installed Cloakwise.