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The imports are:

import java.net.*;
import java.io.*;
import java.applet.*;
import java.awt.*;

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The errors are in the image or here:

java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.parseInt(Integer.java:615)
at...

I'm making this simple chatserver/chatclient gui in java using an applet instead of JFrame. The problem I'm having is that I set the correct run configuration but error comes up when client coonects...