Problems with NEX-Forms Express

Hello,

I use your NEX-Forms Express plugin, version 1.1. When I try to submit a form I get the blank screen. Entered form data is successfully sent to mail e-mail but the page isn’t displayed (By the way I have two form with different ids on the page. First form works correctly but second doesn’t).
In my server logs I can see such records:

[Thu Aug 21 12:44:10 2014] [error] [client 178.49.219.85] \xd0\x91\xd0\xb0\xd0\xb7\xd0\xb0 \xd0\xb4\xd0\xb0\xd0\xbd\xd0\xbd\xd1\x8b\xd1\x85 WordPress \xd0\xb2\xd0\xbe\xd0\xb7\xd0\xb2\xd1\x80\xd0\xb0\xd1\x82\xd0\xb8\xd0\xbb\xd0\xb0 \xd0\xbe\xd1\x88\xd0\xb8\xd0\xb1\xd0\xba\xd1\x83 Unknown column ‘parent_Id’ in ‘where clause’ \xd0\xb2 \xd0\xbe\xd1\x82\xd0\xb2\xd0\xb5\xd1\x82 \xd0\xbd\xd0\xb0 \xd0\xb7\xd0\xb0\xd0\xbf\xd1\x80\xd0\xbe\xd1\x81 SELECT * FROM wp_wap_nex_forms WHERE parent_Id = ‘1’, \xd0\xb2\xd1\x8b\xd0\xbf\xd0\xbe\xd0\xbb\xd0\xbd\xd0\xb5\xd0\xbd\xd0\xbd\xd1\x8b\xd0\xb9 do_action(‘wp_ajax_delete_record’), call_user_func_array, IZC_Database::delete_record, IZC_Database::get_descendants, IZC_Database::has_child, referer: https://zodiak-anapa.ru/wp-admin/admin.php?page=nex-formsexpress-main
[Thu Aug 21 12:44:10 2014] [error] [client 178.49.219.85] \xd0\x91\xd0\xb0\xd0\xb7\xd0\xb0 \xd0\xb4\xd0\xb0\xd0\xbd\xd0\xbd\xd1\x8b\xd1\x85 WordPress \xd0\xb2\xd0\xbe\xd0\xb7\xd0\xb2\xd1\x80\xd0\xb0\xd1\x82\xd0\xb8\xd0\xbb\xd0\xb0 \xd0\xbe\xd1\x88\xd0\xb8\xd0\xb1\xd0\xba\xd1\x83 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1 \xd0\xb2 \xd0\xbe\xd1\x82\xd0\xb2\xd0\xb5\xd1\x82 \xd0\xbd\xd0\xb0 \xd0\xb7\xd0\xb0\xd0\xbf\xd1\x80\xd0\xbe\xd1\x81 DELETE FROM wp_wap_nex_forms WHERE Id = , \xd0\xb2\xd1\x8b\xd0\xbf\xd0\xbe\xd0\xbb\xd0\xbd\xd0\xb5\xd0\xbd\xd0\xbd\xd1\x8b\xd0\xb9 do_action(‘wp_ajax_delete_record’), call_user_func_array, IZC_Database::delete_record, referer: https://zodiak-anapa.ru/wp-admin/admin.php?page=nex-formsexpress-main
[Thu Aug 21 12:44:17 2014] [error] [client 178.49.219.85] \xd0\x91\xd0\xb0\xd0\xb7\xd0\xb0 \xd0\xb4\xd0\xb0\xd0\xbd\xd0\xbd\xd1\x8b\xd1\x85 WordPress \xd0\xb2\xd0\xbe\xd0\xb7\xd0\xb2\xd1\x80\xd0\xb0\xd1\x82\xd0\xb8\xd0\xbb\xd0\xb0 \xd0\xbe\xd1\x88\xd0\xb8\xd0\xb1\xd0\xba\xd1\x83 Unknown column ‘parent_Id’ in ‘where clause’ \xd0\xb2 \xd0\xbe\xd1\x82\xd0\xb2\xd0\xb5\xd1\x82 \xd0\xbd\xd0\xb0 \xd0\xb7\xd0\xb0\xd0\xbf\xd1\x80\xd0\xbe\xd1\x81 SELECT * FROM wp_wap_nex_forms WHERE parent_Id = ‘5’, \xd0\xb2\xd1\x8b\xd0\xbf\xd0\xbe\xd0\xbb\xd0\xbd\xd0\xb5\xd0\xbd\xd0\xbd\xd1\x8b\xd0\xb9 do_action(‘wp_ajax_delete_record’), call_user_func_array, IZC_Database::delete_record, IZC_Database::get_descendants, IZC_Database::has_child, referer: https://zodiak-anapa.ru/wp-admin/admin.php?page=nex-formsexpress-main
[Thu Aug 21 12:44:17 2014] [error] [client 178.49.219.85] \xd0\x91\xd0\xb0\xd0\xb7\xd0\xb0 \xd0\xb4\xd0\xb0\xd0\xbd\xd0\xbd\xd1\x8b\xd1\x85 WordPress \xd0\xb2\xd0\xbe\xd0\xb7\xd0\xb2\xd1\x80\xd0\xb0\xd1\x82\xd0\xb8\xd0\xbb\xd0\xb0 \xd0\xbe\xd1\x88\xd0\xb8\xd0\xb1\xd0\xba\xd1\x83 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1 \xd0\xb2 \xd0\xbe\xd1\x82\xd0\xb2\xd0\xb5\xd1\x82 \xd0\xbd\xd0\xb0 \xd0\xb7\xd0\xb0\xd0\xbf\xd1\x80\xd0\xbe\xd1\x81 DELETE FROM wp_wap_nex_forms WHERE Id = , \xd0\xb2\xd1\x8b\xd0\xbf\xd0\xbe\xd0\xbb\xd0\xbd\xd0\xb5\xd0\xbd\xd0\xbd\xd1\x8b\xd0\xb9 do_action(‘wp_ajax_delete_record’), call_user_func_array, IZC_Database::delete_record, referer: https://zodiak-anapa.ru/wp-admin/admin.php?page=nex-formsexpress-main

Could you give me advice what is a problem?
Thanks

https://www.ads-software.com/plugins/nex-forms-express-wp-form-builder/