Vault 3.0 not working getting not found error

Anyone have any luck with the new 3.0 vault. I can not get it to work. I do not understand the node.js part of it
I can get the form to show up and I can upload but I keep getting a not found error

node.js part is a testing server. Here you can find a detailed explanation of that code:
https://docs.dhtmlx.com/vault/uploading_files.html