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java.util.ConcurrentModificationException at java.util.SubList.checkForComodification(AbstractList.java:769) at java.util.SubList.listIterator(AbstractList.java:695) at java.util.AbstractList.listIterator(AbstractList.java:299) at java.util.Collections$SynchronizedList.listIterator(Collections.java:2441) at java.util.AbstractList.equals(AbstractList.java:519) at java.util.Collections$SynchronizedList.equals(Collections.java:2410) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:297) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:275) at sun.awt.shell.ShellFolderManager$DirectInvoker.invoke(ShellFolderManager.java:113) at sun.awt.shell.ShellFolder.invoke(ShellFolder.java:518) at sun.awt.shell.ShellFolder.invoke(ShellFolder.java:504) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run0(BasicDirectoryModel.java:275) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run(BasicDirectoryModel.java:228)