서버를 열고 들어가면 지형 불러오는중 이라는 화면이 계속되다가 시간초과가 뜨며 나가지면 버킷에 아래와 같은 글씨가 나오며 작동을 안합니다.....
어떻게 해결해야 될까요...?

(평소에는 계속 잘 되다가 갑자기 안됬습니다...)

<서버 터질때 나오는 글씨>

[20:51:16] [Timer-3/WARN]: CatServer version check failed, please check network: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed

[20:51:49] [Spigot Watchdog Thread/ERROR]: The server has stopped responding!

[20:51:49] [Spigot Watchdog Thread/ERROR]: Spigot version: git-CatServer-1.12.2-090a6ffb (MC: 1.12.2)

[20:51:49] [Spigot Watchdog Thread/ERROR]: Memory using: 3646MB/16189MB/16189MB

[20:51:49] [Spigot Watchdog Thread/ERROR]: ------------------------------

[20:51:49] [Spigot Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.Object.wait(Native Method)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.util.TimerThread.mainLoop(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.util.TimerThread.run(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]: ------------------------------

[20:51:50] [Spigot Watchdog Thread/ERROR]: Current Thread: Timer-0

[20:51:50] [Spigot Watchdog Thread/ERROR]:      PID: 51 | Suspended: false | Native: false | State: TIMED_WAITING

[20:51:50] [Spigot Watchdog Thread/ERROR]:      Stack:

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.Object.wait(Native Method)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.util.TimerThread.mainLoop(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.util.TimerThread.run(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:      Stack:

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.Object.wait(Native Method)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.ref.ReferenceQueue.remove(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.ref.ReferenceQueue.remove(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]: ------------------------------

[20:51:50] [Spigot Watchdog Thread/ERROR]: Current Thread: Reference Handler

[20:51:50] [Spigot Watchdog Thread/ERROR]:      PID: 2 | Suspended: false | Native: false | State: WAITING

[20:51:50] [Spigot Watchdog Thread/ERROR]:      Stack:

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.Object.wait(Native Method)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.Object.wait(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.ref.Reference.tryHandlePending(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]:              java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)

[20:51:50] [Spigot Watchdog Thread/ERROR]: ------------------------------