Error Using Cursor

Please advise, when trying to create a cursor, when pressing ‘save’ we get this error, and the cursor does not work:

Modify header information – headers already sent by (output started at /home/customer/www/*domain*.co.uk/public_html/wp-content/plugins/wp-custom-cursors/admin/class-wp-custom-cursors-admin.php:514) in?/home/customer/www/*domain*.co.uk/public_html/wp-admin/includes/misc.php?on line?1431