Throwing nosuchmethod error

I am writing own minecraft server and currently writing unit tests for my protocol implementation. The best way to be sure that all is fine use external library. Here my unit test:

    public void testPing() {
        MinecraftProtocol protocol = new MinecraftProtocol(ProtocolMode.STATUS);
        Client client = new Client("localhost", 25565, protocol, new TcpSessionFactory());
        client.getSession().setFlag(
                ProtocolConstants.SERVER_INFO_HANDLER_KEY, (ServerInfoHandler) (session, info) -> {
            assertEquals("Test", info.getDescription().getFullText());
            assertEquals("1.7.4", info.getVersionInfo().getVersionName());
            assertEquals(5, info.getVersionInfo().getProtocolVersion());
            assertEquals(2, info.getPlayerInfo().getOnlinePlayers());
            assertEquals(10, info.getPlayerInfo().getMaxPlayers());
        });

        client.getSession().connect();
    }

Exception:

java.lang.NoSuchMethodError: io.netty.bootstrap.Bootstrap.channel(Ljava/lang/Class;)Lio/netty/bootstrap/Bootstrap;
    at org.spacehq.packetlib.tcp.TcpSessionFactory.createClientSession(TcpSessionFactory.java:37)
    at org.spacehq.packetlib.Client.<init>(Client.java:19)
    at ru.ensemplix.server.ping.TestPing.testPing(TestPing.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)

Library was added to my project by your maven repository. Would be very thankful for fixing this problem.

Fixed by changing my netty version to packetlib netty version.