2
Looks like these are missing defines in the language file for the module
The first ones you mentioned i.e.
_NW_NOTIFYMSG
These are called in this file around lines 160, 161
modules/wfsections/submit.php
_WFS_THANKS and the others probably needs to be defined in:
wfsections/language/english/main.php
like this:
define("_WFS_THANKS","Thanks for your submission.");
define("_NW_NOTIFYSBJCT","anything"); // Notification mail subject
define("_NW_NOTIFYMSG","Hey! You got a new submission for your site."); // Notification mail message