Friend, could you help me, you are presenting the following error message and still sending a message without discord.

Web request produced exception (Url: ) in 'DiscordMessages v2.1.2' plugin (UriFormatException: Invalid URI: The URI is empty.)
at System.Uri.CreateThis (System.String uri, System.Boolean dontEscape, System.UriKind uriKind) [0x0007b] in <ae22a4e8f83c41d69684ae7f557133d9>:0
at System.Uri..ctor (System.String uriString) [0x00014] in <ae22a4e8f83c41d69684ae7f557133d9>:0
at System.Net.WebRequest.Create (System.String requestUriString) [0x0000e] in <ae22a4e8f83c41d69684ae7f557133d9>:0 2kb/s in, 13kb/s out
at Oxide.Core.Libraries.WebRequests+WebRequest.Start () [0x00014] in <1fe782f4b27a43ae85d29ebb2d56c007>:0​

That error would imply that your configuration is invalid, that a URL was not configured. Please make sure you've configured the plugin fully.

@Wulf I'll try again, but I'm using the same Websocket that is working on the discord plugin, and I have no problem with the implementation.

This plugin doesn't use websockets, it uses webhooks via the dependent plugin shown on the plugin page.