[Arhowk]

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

        NetworkTable.setIPAddress("10.20.12.2");
        NetworkTable.setClientMode();
        try {
            NetworkTable.initialize();
        } catch (Exception e) {
            e.printStackTrace();
        }
        t = NetworkTable

but it prints this error

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)