get this error when i search for items in inventories

[Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task java.util.concurrent.ExecutionException: java.lang.AbstractMethodError: Method com/infinityraider/agricraft/tiles/analyzer/TileEntitySeedAnalyzer.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_201] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_201] at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185) [chd.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_201] Caused by: java.lang.AbstractMethodError: Method com/infinityraider/agricraft/tiles/analyzer/TileEntitySeedAnalyzer.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract at com.infinityraider.agricraft.tiles.analyzer.TileEntitySeedAnalyzer.getStackInSlot(TileEntitySeedAnalyzer.java) ~[TileEntitySeedAnalyzer.class:?] at com.rwtema.extrautils2.crafting.Radar$PacketPing.lambda$doStuffServer$1(Radar.java:185) ~[Radar$PacketPing.class:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_201] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_201] at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]