I need help understanding this error

Hey there
My server is freeze today, and I don’t understand why.
Please help understand why freeze my server. Thanks.
Paper build 138

[15:22:07] [Paper Watchdog Thread/ERROR]: — DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH - git-Paper-146 (MC: 1.14.4) —
[15:22:07] [Paper Watchdog Thread/ERROR]: The server has not responded for 10 seconds! Creating thread dump
[15:22:07] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:22:07] [Paper Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Paper!):
[15:22:07] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:22:07] [Paper Watchdog Thread/ERROR]: Current Thread: Server thread
[15:22:07] [Paper Watchdog Thread/ERROR]: PID: 33 | Suspended: false | Native: false | State: BLOCKED
[15:22:07] [Paper Watchdog Thread/ERROR]: Stack:
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.NetworkManager.o(NetworkManager.java:232)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.NetworkManager.sendPacketQueue(NetworkManager.java:227)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.NetworkManager.sendPacket(NetworkManager.java:167)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1521)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.PlayerConnection.sendPacket(PlayerConnection.java:1494)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.EntityTrackerEntry.sendPlayerPacket(EntityTrackerEntry.java:47)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.EntityTrackerEntry.a(EntityTrackerEntry.java:190)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.PlayerChunkMap.g(PlayerChunkMap.java:1182)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.ChunkProviderServer.tickChunks(ChunkProviderServer.java:527)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.ChunkProviderServer.tick(ChunkProviderServer.java:416)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.WorldServer.doTick(WorldServer.java:267)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1207)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:420)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:1074)
[15:22:07] [Paper Watchdog Thread/ERROR]: app//net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:918)
[15:22:07] [Paper Watchdog Thread/ERROR]: [email protected]/java.lang.Thread.run(Thread.java:834)
[15:22:07] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:22:07] [Paper Watchdog Thread/ERROR]: — DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH —
[15:22:07] [Paper Watchdog Thread/ERROR]: ------------------------------