java.lang.NoClassDefFoundError: cn/nukkit/timings/Timings

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java.lang.ClassNotFoundException: cn.nukkit.timings.Timings
at cn.nukkit.plugin.PluginClassLoader.findClass(
at cn.nukkit.plugin.PluginClassLoader.findClass(
at java.lang.ClassLoader.loadClass(Unknown Source)
at de.kniffo80.mobplugin.entities.animal.WalkingAnimal.entityBaseTick(
at de.kniffo80.mobplugin.entities.animal.WalkingAnimal.onUpdate(
at cn.nukkit.level.Level.doTick(
at cn.nukkit.Server.checkTickUpdates(
at cn.nukkit.Server.tick(
at cn.nukkit.Server.tickProcessor(
at cn.nukkit.Server.start(
at cn.nukkit.Server.(
at cn.nukkit.Nukkit.main(

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