I keep getting error for line 15

change it to..
// <?php If php starting is missing then plz add it....

define('HEADING_TITLE', 'Contact Us');
define('NAVBAR_TITLE', 'Contact Us');
define('TEXT_SUCCESS', 'Your enquiry has been successfully sent to the Store Owner.');
define('EMAIL_SUBJECT', 'Enquiry from "MMSWEETS"');
define('ENTRY_NAME', 'Full Name:');
define('ENTRY_EMAIL', 'E-Mail Address:');
define('ENTRY_ENQUIRY', 'Enquiry:');
?>
<!----php should be closed before html starts-->
<p>&nbsp;</p>
<p>&nbsp;</p>

There's too much apostrophes in define('EMAIL_SUBJECT', ... Is this line 15?
Change it to define('EMAIL_SUBJECT', "Enquiry from 'MMSWEETS'");