The error is saying that the file:
WA_Universal_Email/WAUE_confirm_1.php
is not on the server.
make sure you have uploaded the entire WA_Universal_Email folder to the server.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.