java.lang.NullPointerException

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    • java.lang.NullPointerException at biz.martyn.budget.CategoryComboBox.update(CategoryComboBox.java:24) at biz.martyn.budget.CategoryComboBox.<init>(CategoryComboBox.java:17) at biz.martyn.budget.NewTransactionDialog.<init>(NewTransactionDialog.java:36) at biz.martyn.budget.TransactionsToolbar.<init>(TransactionsToolbar.java:34) at biz.martyn.budget.Budget.main(Budget.java:41)
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