java.lang.NoClassDefFoundError: io/netty/handler/ssl/SslContextBuilder

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java.lang.NoClassDefFoundError: io/netty/handler/ssl/SslContextBuilder
at org.asynchttpclient.netty.ssl.DefaultSslEngineFactory.buildSslContext(DefaultSslEngineFactory.java:35)
at org.asynchttpclient.netty.ssl.DefaultSslEngineFactory.init(DefaultSslEngineFactory.java:56)
at org.asynchttpclient.netty.channel.ChannelManager.(ChannelManager.java:116)
at org.asynchttpclient.DefaultAsyncHttpClient.(DefaultAsyncHttpClient.java:81)

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