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

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java.lang.NullPointerException:
at algorithms.HBOP2Builder.(HBOP2Builder.java:59)
at algorithms.HBOP2Builder.(HBOP2Builder.java:25)
at algorithms.HPBOP2Alg.buildHaplotype(HPBOP2Alg.java:24)
at main.PolyPlotyping.Polyphasing(PolyPlotyping.java:224)
at main.PolyPlotyping.go(PolyPlotyping.java:159)
at main.PolyPlotyping.main(PolyPlotyping.java:280)

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