hi i have a small server with a freind of mine and we both have rats.

i discovered today this in my server console. but the server isn't crashing. What should i doo?

[Server thread/ERROR] [co.gi.al.ra.RatsMod/CATCHING]: Catching
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: com/github/alexthe666/rats/server/pathfinding/pathjobs/AbstractPathJob$SurfaceType
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_282] {}
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_282] {}
at com.github.alexthe666.rats.server.pathfinding.RatAdvancedPathNavigate.processCompletedCalculationResult(RatAdvancedPathNavigate.java:324) ~[rats:7.1.0] {re:classloading}
at com.github.alexthe666.rats.server.pathfinding.RatAdvancedPathNavigate.func_75501_e(RatAdvancedPathNavigate.java:148) ~[rats:7.1.0] {re:classloading}
at net.minecraft.entity.MobEntity.func_70626_be(MobEntity.java:685) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.entity.LivingEntity.func_70636_d(LivingEntity.java:2411) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.entity.MobEntity.func_70636_d(MobEntity.java:488) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.entity.AgeableEntity.func_70636_d(SourceFile:127) ~[?:?] {re:classloading}
at net.minecraft.entity.passive.AnimalEntity.func_70636_d(AnimalEntity.java:51) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at com.github.alexthe666.rats.server.entity.EntityRat.func_70636_d(EntityRat.java:1012) ~[rats:7.1.0] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2158) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:850) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:786) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:641) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:232) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282] {}
Caused by: java.lang.NoClassDefFoundError: com/github/alexthe666/rats/server/pathfinding/pathjobs/AbstractPathJob$SurfaceType
at com.github.alexthe666.rats.server.pathfinding.pathjobs.AbstractPathJob.isWalkableSurface(AbstractPathJob.java:1150) ~[rats:7.1.0] {re:classloading}
at com.github.alexthe666.rats.server.pathfinding.pathjobs.AbstractPathJob.getGroundHeight(AbstractPathJob.java:834) ~[rats:7.1.0] {re:classloading}
at com.github.alexthe666.rats.server.pathfinding.pathjobs.PathJobMoveToLocation.search(PathJobMoveToLocation.java:57) ~[rats:7.1.0] {re:classloading}
at com.github.alexthe666.rats.server.pathfinding.pathjobs.AbstractPathJob.call(AbstractPathJob.java:392) ~[rats:7.1.0] {re:classloading}
at com.github.alexthe666.rats.server.pathfinding.pathjobs.AbstractPathJob.call(AbstractPathJob.java:39) ~[rats:7.1.0] {re:classloading}
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282] {}
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_282] {}
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_282] {}