Can bind the ability and attempt to use it, but when firing the ability nothing happens and this log is written:

12:51:04 [Error] [lambdalib2]: Error during network message.java.lang.reflect.InvocationTargetException: null at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_102] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_102] at cn.lambdalib2.s11n.network.NetworkMessage$2.invoke(NetworkMessage.java:230) ~[NetworkMessage$2.class:?] at cn.lambdalib2.s11n.network.NetworkMessage.invokeListener(NetworkMessage.java:157) ~[NetworkMessage.class:?] at cn.lambdalib2.s11n.network.NetworkMessage.processMessage(NetworkMessage.java:138) ~[NetworkMessage.class:?] at cn.lambdalib2.s11n.network.NetworkMessage.access$000(NetworkMessage.java:54) ~[NetworkMessage.class:?] at cn.lambdalib2.s11n.network.NetworkMessage$Handler.lambda$onMessage$0(NetworkMessage.java:381) ~[NetworkMessage$Handler.class:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_102] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_102] at net.minecraft.util.Util.runTask(SourceFile:529) [h.class:?] at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:723) [MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:397) [nz.class:?] at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?] at java.lang.Thread.run(Thread.java:745) [?:1.8.0_102]Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: cn.academy.ability.vanilla.vecmanip.skill.GroundshockContext at com.google.common.base.Throwables.propagate(Throwables.java:240) ~[minecraft_server.1.12.2.jar:?] at cn.academy.ability.context.ContextManager.readContextType(ContextManager.java:168) ~[ContextManager.class:?] at cn.academy.ability.context.ContextManager.access$600(ContextManager.java:40) ~[ContextManager.class:?] at cn.academy.ability.context.ContextManager$ServerManager.hBeginLink(ContextManager.java:411) ~[ContextManager$ServerManager.class:?] ... 16 moreCaused by: java.lang.ClassNotFoundException: cn.academy.ability.vanilla.vecmanip.skill.GroundshockContext at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_102] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_102] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_102] at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_102] at cn.academy.ability.context.ContextManager.readContextType(ContextManager.java:166) ~[ContextManager.class:?] at cn.academy.ability.context.ContextManager.access$600(ContextManager.java:40) ~[ContextManager.class:?] at cn.academy.ability.context.ContextManager$ServerManager.hBeginLink(ContextManager.java:411) ~[ContextManager$ServerManager.class:?] ... 16 more.