I've created a booking form (booking_form.php) using CSS Form Builder 1 and Universal Email 4. When I click submit I receive the following message:
Notice: Use of undefined constant undefined - assumed 'undefined' in /clientdata/zeus-dynamic-1/t/s/tsvllc.com.au/www/booking_form.php on line 16
Warning: Cannot modify header information - headers already sent by (output started at /clientdata/zeus-dynamic-1/t/s/tsvllc.com.au/www/booking_form.php:16) in /clientdata/zeus-dynamic-1/t/s/tsvllc.com.au/www/WA_ValidationToolkit/WAVT_Scripts_PHP.php on line 71
When the submit button is clicked it is suppose to go to a 'thank you' page. Can you please give me some advice as to what is wrong here and how I may correct the problem.