ajax form submit error

I’m submiting a form with ajax I’m facing thins error only for submiting form value into database but when I do echo its showing fine . I can’t understand what to do..

my ajax page code is

<?php
 echo $_POST['name'];
 echo $_POST['email'];
 echo $_POST['date'];

$name = $_POST['name'];
			$email = $_POST['email'];
			$date = $_POST['date'];

			global $wpdb;
			$wpdb->insert("wp_form_data", array(
			   "name" => $name,
			   "email" => $email,
			   "date" => $date,
			   "verify" => "not verified",

			));

//$_SESSION['uemail'] = $_POST['ufemail'];

?>

error
https://prntscr.com/9fkl8u

please help. very urgent