[18:48:51] [Craft Scheduler Thread - 708/WARN]: java.io.IOException: Server returned HTTP response code: 403 for URL: ht
tps://api.mojang.com/profiles/minecraft
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(U
nknown Source)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Un
known Source)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStr
eam(Unknown Source)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at com.worldcretornica.plotme_core.utils.UUIDFetcher.call(UUIDFe
tcher.java:112)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at com.worldcretornica.plotme_core.utils.UUIDFetcher.getUUIDOf(U
UIDFetcher.java:91)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at com.worldcretornica.plotme_core.SqlManager$3.run(SqlManager.j
ava:2225)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(Craft
Task.java:76)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(
CraftAsyncTask.java:52)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Sou
rce)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown So
urce)
[18:48:51] [Craft Scheduler Thread - 708/WARN]:         at java.lang.Thread.run(Unknown Source)

请发crash report和latest.log

你发的这段只能看出是地皮core的问题
下次请发附件

您好楼主
请提供一下服务端的logs

你发的这段内容也太少了，不过还是可以看出些问题
开头一个403和api.mojang.com/profiles/minecraft
显然，你的某个插件在试图向mojang询问玩家的uuid，然后网不好，所以它卡住了
只要把这个插件揪出来删掉就行
揪不出来也没关系，加个这个插件
BlockMojang
简单暴力屏蔽所有Mojang API和相关服务
https://www.mcbbs.net/thread-1041007-1-1.html

你的网络访问不到Mojang导致卡线程
添加一个插件 SkullsAPI
https://www.spigotmc.org/resourc ... lag-1-8-1-17.85422/
应该就既可以解决你的问题