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

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java.lang.NoClassDefFoundError:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:135)
at java.awt.Toolkit$2.run(Toolkit.java:715)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:706)
at javax.swing.ImageIcon.(ImageIcon.java:122)
at javax.swing.ImageIcon.(ImageIcon.java:141)
at undefined.ImageServerThread.run(ImageServerThread.java:50)

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