java.lang.NoClassDefFoundError: Task$1

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java.lang.NoClassDefFoundError: Task$1
at undefined.Task.installb(Task.java:38)
at undefined.Install.actionPerformed(Install.java:125)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)

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