startup error

[09:19:32] [Craft Scheduler Thread - 463/WARN]: java.io.FileNotFoundException: https://api.mojang.com/users/profiles/minecraft/imgbot[bot]
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at java.net.URL.openStream(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at me.mrCookieSlime.Slimefun.cscorelib2.players.MinecraftAccount.getUUID(MinecraftAccount.java:45)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at me.mrCookieSlime.Slimefun.SlimefunPlugin.lambda$onEnable$2(SlimefunPlugin.java:319)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:84)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[09:19:32] [Craft Scheduler Thread - 463/WARN]: 	at java.lang.Thread.run(Unknown Source)