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

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This exception has no message.
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java.lang.NullPointerException:
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.sort(Unknown Source)
at undefined.Application.addApplication(Application.java:141)
at undefined.Software.addSoftware(Software.java:99)
at undefined.Software.main(Software.java:23)

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