Unable to import form that was exported yesterday

I exported a NEX Forms form yesterday, and now it wont import back into my wordpress site - I am getting a 403 error.

My ISP has investigated, and found the following error, which they said I should follow up with the developers:

WordPress database error Column count doesn’t match value count at row 1 for query INSERT INTO willitdk_wap_nex_forms (``) VALUES () made by do_action(‘wp_ajax_do_form_import’), WP_Hook->do_action, WP_Hook->apply_filters, NEXForms_Database_Actions::do_form_import, referer: http://willitwork.co.za/wp-admin/admin.php?page=nex-forms-dashboard

Can anyone help?!