[04:47:53 WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@416360bf[id=40ffb372-12f6-4678-b3f2-2176bf56dd4b,name=MHF_Enderman,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:85) ~[server.jar:git-Spigot-65e8124-bde2a93]
	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:180) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:173) [server.jar:git-Spigot-65e8124-bde2a93]
	at net.minecraft.server.v1_12_R1.TileEntitySkull$1.load(TileEntitySkull.java:76) [server.jar:git-Spigot-65e8124-bde2a93]
	at net.minecraft.server.v1_12_R1.TileEntitySkull$1.load(TileEntitySkull.java:1) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3716) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2424) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2298) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2211) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache.get(LocalCache.java:4154) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4158) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:5147) [server.jar:git-Spigot-65e8124-bde2a93]
	at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:5153) [server.jar:git-Spigot-65e8124-bde2a93]
	at net.minecraft.server.v1_12_R1.TileEntitySkull$3.run(TileEntitySkull.java:201) [server.jar:git-Spigot-65e8124-bde2a93]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_144]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_144]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
Caused by: java.net.UnknownHostException: sessionserver.mojang.com
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) ~[?:1.8.0_144]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.8.0_144]
	at java.net.Socket.connect(Socket.java:589) ~[?:1.8.0_144]
	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:673) ~[?:1.8.0_144]
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175) ~[?:1.8.0_144]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) ~[?:1.8.0_144]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) ~[?:1.8.0_144]
	at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264) ~[?:1.8.0_144]
	at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367) ~[?:1.8.0_144]
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191) ~[?:1.8.0_144]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1181) ~[?:1.8.0_144]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032) ~[?:1.8.0_144]
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177) ~[?:1.8.0_144]
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546) ~[?:1.8.0_144]
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) ~[?:1.8.0_144]
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) ~[?:1.8.0_144]
	at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:130) ~[server.jar:git-Spigot-65e8124-bde2a93]
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:66) ~[server.jar:git-Spigot-65e8124-bde2a93]
	... 16 more