ftop error

>.... [16:28:09 WARN]: [SavageFTOP] Task #9191 for SavageFTOP v1.5.2 generated an exception
java.lang.NoSuchMethodError: org.bukkit.Chunk.unload(ZZ)Z
at net.prosavage.factiontop.runnable.ChunkCollector.run(ChunkCollector.java:65) ~[?:?]
at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.14.4.jar:git-Paper-207]
at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:452) ~[patched_1.14.4.jar:git-Paper-207]
at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1171) ~[patched_1.14.4.jar:git-Paper-207]
at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:417) ~[patched_1.14.4.jar:git-Paper-207]
at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:1098) ~[patched_1.14.4.jar:git-Paper-207]
at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:925) ~[patched_1.14.4.jar:git-Paper-207]