Chief Delphi - NetworkTable error

I'm trying to make a SmartDashboard application that communicates with the robot via network tables. Im trying to use this code

Code:

        NetworkTable.setIPAddress("10.20.12.2");

        NetworkTable.setClientMode();

        try {

            NetworkTable.initialize();

        } catch (Exception e) {

            e.printStackTrace();

        }

        t = NetworkTable

but it prints this error

Code:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/microedition/io/Connector

        at edu.wpi.first.wpilibj.networktables2.stream.SocketConnectionStream.<init>(SocketConnectionStream.java:26)

        at edu.wpi.first.wpilibj.networktables2.stream.SocketConnectionStreamFactory.createStream(SocketConnectionStreamFactory.java:27)

        at edu.wpi.first.wpilibj.networktables2.client.ClientConnectionAdapter.reconnect(ClientConnectionAdapter.java:84)

        at edu.wpi.first.wpilibj.networktables2.client.NetworkTableClient.reconnect(NetworkTableClient.java:46)

        at edu.wpi.first.wpilibj.networktables.NetworkTableMode$2.createNode(NetworkTableMode.java:39)

        at edu.wpi.first.wpilibj.networktables.NetworkTable.initialize(NetworkTable.java:52)

        at edu.wpi.first.wpilibj.networktables.NetworkTable.getTable(NetworkTable.java:106)

        at org.chimeras1684.ui.operation.SerialByteStreamReciever.<clinit>(SerialByteStreamReciever.java:26)

        at org.chimeras1684.ui.operation.NewDriverUI.main(NewDriverUI.java:35)

Caused by: java.lang.ClassNotFoundException: javax.microedition.io.Connector

        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)

        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)

        ... 9 more

Exception in thread "Write Manager Thread" java.lang.NoClassDefFoundError: javax/microedition/io/Connector

        at edu.wpi.first.wpilibj.networktables2.stream.SocketConnectionStream.<init>(SocketConnectionStream.java:26)

        at edu.wpi.first.wpilibj.networktables2.stream.SocketConnectionStreamFactory.createStream(SocketConnectionStreamFactory.java:27)

        at edu.wpi.first.wpilibj.networktables2.client.ClientConnectionAdapter.reconnect(ClientConnectionAdapter.java:84)

        at edu.wpi.first.wpilibj.networktables2.client.ClientConnectionAdapter.ensureAlive(ClientConnectionAdapter.java:214)

        at edu.wpi.first.wpilibj.networktables2.WriteManager.run(WriteManager.java:146)

        at edu.wpi.first.wpilibj.networktables2.thread.DefaultThreadManager$PeriodicNTThread$1.run(DefaultThreadManager.java:18)

        at java.lang.Thread.run(Thread.java:722)