java.lang.NullPointerException

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    • java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:345) at java.awt.Container.add(Container.java:228) at StockFrame$stockPanel.<init>(StockFrame.java:158) at StockFrame.<init>(StockFrame.java:59) at Stocktester.main(Stocktester.java:12)

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