java.lang.IllegalArgumentException

Component must be non-null

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  • Stack trace

    • java.lang.IllegalArgumentException: Component must be non-null at javax.swing.GroupLayout$ComponentSpring.<init>(GroupLayout.java:2878) at javax.swing.GroupLayout$ComponentSpring.<init>(GroupLayout.java:2858) at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1490) at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2414) at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2384) at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1471) at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2406) at library.<init>(library.java:269) at library.main(library.java:515)

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