switch (playerTurn){
            case 1:
                Card value = playerDecks[0][0];
                int cardVal = value.returnUltimate();
                String cardSu = value.returnCardSuite();
                ImageIcon newIcon = new ImageIcon(getClass().getResource("../../card game icons/" + cardSu + "/" + cardVal + ".png"));
                jLabel3.setIcon(newIcon);
                jLabel3.revalidate();

        }

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:217)
at cards.wargame.jButton1ActionPerformed(wargame.java:151)
at cards.wargame.access$000(wargame.java:14)
at cards.wargame$1.actionPerformed(wargame.java:66)