java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.ImageIcon.(ImageIcon.java:138)
at drivingtest.DrivingTestFrame1.jbInit(DrivingTestFrame1.java:327)
at drivingtest.DrivingTestFrame1.(DrivingTestFrame1.java:110)
at drivingtest.DrivingTest.(DrivingTest.java:20)
at drivingtest.DrivingTest.main(DrivingTest.java:49)

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