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Problem 1 Screenshot 20 Tetris The TrafficJamProject Starter # (default package > Board.java > ConsoleGame.java > Graphics Game.java > Leveljava > Space.java > Vehicle.java > VehicleType.java images auto_vert.png auto.png car_vert.png car.png Thumbs.db 21 22 23 24 25 public void run() { // TODO write this part, Strings = null; s.charAt(0); } 22 Problems Console x Javadoc Declaration Search Call Hierarchy History GraphicsGame (4) [Java Applet] C:\Program Files Java'jre 1.8.0_111\binjavaw.exe (Jan 18, 2018, 10:04:52 AM Exception in thread "Thread-3" java.lang.NullPointerException at Graphics Game.run(GraphicsGame.java:24) at acm.program. Program.runHook (Program.java:1568) at acm.program. Program.startRun (Program, java:1557) at acm.program. AppletStarter.run(Program.java:1895) at java.lang.Thread.run(Unknown Source) Git Repositories What is the problem, and how do you fix it? Your answer What is the name of the method that is directly responsible for invoking/calling Graphic Game's run()? Your