TTT ERROR

[02:42:10] [Thread-12/WARN]: [TTT] The updater could not contact dev.bukkit.org for updating.
[02:42:10] [Thread-12/WARN]: [TTT] If you have not recently modified your configuration and this is the first time you are seeing this message, the site may be experiencing temporary downtime.
[02:42:10] [Thread-12/WARN]: java.io.IOException: Server returned HTTP response code: 504 for URL: https://api.curseforge.com/servermods/files?projectIds=52474
[02:42:10] [Thread-12/WARN]:    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
[02:42:10] [Thread-12/WARN]:    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
[02:42:10] [Thread-12/WARN]:    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
[02:42:10] [Thread-12/WARN]:    at net.amigocraft.TTT.Updater.read(Updater.java:459)
[02:42:10] [Thread-12/WARN]:    at net.amigocraft.TTT.Updater.access$200(Updater.java:40)
[02:42:10] [Thread-12/WARN]:    at net.amigocraft.TTT.Updater$UpdateRunnable.run(Updater.java:497)
[02:42:10] [Thread-12/WARN]:    at java.lang.Thread.run(Unknown Source)