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Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
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Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
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Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
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Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
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Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
via Stack Overflow by user481710
, 10 months ago
Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
java.lang.Error: Do not use javax.swing.JFrame.add()
use javax.swing.JFrame.getContentPane().add() instead	at javax.swing.JFrame.createRootPaneException(JFrame.java:402)	at javax.swing.JFrame.addImpl(JFrame.java:428)	at java.awt.Container.add(Container.java:228)	at Proyecto.(Proyecto.java:43)	at Proyecto.main(Proyecto.java:208)