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

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java.lang.NullPointerException:
at net.java.sipmack.softphone.SoftPhoneManager.(SoftPhoneManager.java:138)
at net.java.sipmack.softphone.SoftPhoneManager.getInstance(SoftPhoneManager.java:183)
at com.jivesoftware.sparkplugin.SoftPhonePlugin$1.construct(SoftPhonePlugin.java:64)
at org.jivesoftware.spark.util.SwingWorker$2.run(SwingWorker.java:129)
at java.lang.Thread.run(Thread.java:595)

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