[22:00:18 ERROR]: Encountered an unexpected exception
java.lang.NoClassDefFoundError: Could not initialize class net.minecraft.server.v1_12_R1.Cras                                     hReport
        at net.minecraft.server.v1_12_R1.Entity.f(Entity.java:1753) ~[patched_1.12.2.jar:git-                                     Paper-1268]
        at net.minecraft.server.v1_12_R1.EntityTypes.a(EntityTypes.java:76) ~[patched_1.12.2.                                     jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.ChunkRegionLoader.a(ChunkRegionLoader.java:547) ~[pa                                     tched_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.ChunkRegionLoader.a(ChunkRegionLoader.java:488) ~[pa                                     tched_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.ChunkRegionLoader.loadEntities(ChunkRegionLoader.jav                                     a:451) ~[patched_1.12.2.jar:git-Paper-1268]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider                                     .java:45) ~[patched_1.12.2.jar:git-Paper-1268]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider                                     .java:16) ~[patched_1.12.2.jar:git-Paper-1268]
        at org.bukkit.craftbukkit.v1_12_R1.util.AsynchronousExecutor$Task.finish(Asynchronous                                     Executor.java:188) ~[patched_1.12.2.jar:git-Paper-1268]
        at org.bukkit.craftbukkit.v1_12_R1.util.AsynchronousExecutor.finishActive(Asynchronou                                     sExecutor.java:347) ~[patched_1.12.2.jar:git-Paper-1268]
        at org.bukkit.craftbukkit.v1_12_R1.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:                                     36) ~[patched_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:859) ~[patche                                     d_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) ~[patche                                     d_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) ~[patche                                     d_1.12.2.jar:git-Paper-1268]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [patch                                     ed_1.12.2.jar:git-Paper-1268]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]