00:51:24 [SEVERE] [ChangeSkin] Tried downloading skin data from Mojang
java.io.IOException: Server returned HTTP response code: 429 for URL: https://sessionserver.mojang.com/session/minecraft/profile/6fee352611444731b57d4b89eb0d466f?unsigned=false
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
    at com.github.games647.changeskin.core.ChangeSkinCore.downloadSkin(ChangeSkinCore.java:183)
    at com.github.games647.changeskin.bungee.tasks.SkinInvalidater.run(SkinInvalidater.java:32)
    at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:52)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
00:51:24 [SEVERE] Task BungeeTask(sched=net.md_5.bungee.scheduler.BungeeScheduler@2fba6d39, id=6, owner=com.github.games647.changeskin.bungee.ChangeSkinBungee@3c73951, task=com.github.games647.changeskin.bungee.tasks.SkinInvalidater@4560a9e4, delay=0, period=0, running=true) encountered an exception
java.lang.NullPointerException
    at com.github.games647.changeskin.bungee.tasks.SkinInvalidater.run(SkinInvalidater.java:33)
    at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:52)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)