java.lang.NoClassDefFoundError: io/socket/engineio/client/Socket$Options

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A few things cause this exception:
1) Check if you have all jars and if they're in the correct path.
2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.


you can change your scala version to 2.11.11

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java.lang.ClassNotFoundException: io.socket.engineio.client.Socket$Options
at java.lang.ClassLoader.loadClass(
at sun.misc.Launcher$AppClassLoader.loadClass(
at java.lang.ClassLoader.loadClass(

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