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

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java.lang.NullPointerException:
at java.lang.System.arraycopy(Native Method)
at java.lang.String.getChars(Unknown Source)
at java.lang.StringBuffer.append(Unknown Source)
at java.lang.Throwable.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.io.PrintStream.print(Unknown Source)
at java.io.PrintStream.println(Unknown Source)
at samples.rmi.simple.client.ConverterClient.main(Unknown Source)

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