It works now.. I changed
from
/* PHP CODE HERE, IF NECESSARY */
the php body of your custom box here
/* DO NOT CHANGE THE LINE BELOW. IT IS REQUIRED. */
$body = <<<EOF
the html body of your custom box here
EOF;
/* DO NOT CHANGE THE LINE ABOVE. IT IS REQUIRED. */
to
/* PHP CODE HERE, IF NECESSARY */
/* DO NOT CHANGE THE LINE BELOW. IT IS REQUIRED. */
$body = <<<EOF
the html body of your custom box here
EOF;
/* DO NOT CHANGE THE LINE ABOVE. IT IS REQUIRED. */
Sorry to bother you guys with this
