cmd spam?

at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [spigot.jar:git-Spigot-1487]
[02:51:30 WARN]: [Factions] Task #33 for Factions v2.4.0 generated an exception
java.lang.NoSuchMethodError: com.massivecraft.mcore.mixin.Mixin.getLastPlayed(Lj
ava/lang/ObjectLjava/lang/Long;
at com.massivecraft.factions.entity.UPlayerColl.removePlayerDataAfterIna
ctiveDaysRoutine(UPlayerColl.java:51) ~[?:?]
at...

cmd spam?