Once the following information is provided I will reply to you as quick as possible!
Version 5.0.3
Spigot 1.8
After loging in i don't recive the items.
Config --> https://pastebin.com/iwkQLJWw
items --> https://pastebin.com/P38sib1N
There isn't any errors on the console.

Note: I think that the issue is with my login plugin but i'm not sure. Actually I'm using nLogin.

The issue being nLogin would be correct. ItemJoin currently only supports AuthMe which is essentially the same as nLogin. Taking a look at nLogin's page I do not see an available API for me to use which will then give the items (AFTER) you log in via nLogin.

I will do some more digging but I wouldn't be very hopeful in there being a resolution to this. Its probably going to be likely that the author of nLogin will need to implement an API for this.

Ok, but I tryed to switch to authme but when I run the server I can't talk and I can't place commands to.
Do you know why this happens?

That is because you actually have to authenticate yourself. Once you are authenticated it will allow you to talk on the server and execute commands. I would double-check that you setup everything properly via an authme tutorial.

EDIT: I assume this issue has been resolved now, if this problem persists please reopen the issue and I can help you further. If you want a quicker contact method feel free to join the discord! https://discord.gg/D5FnJ7C