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

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at org.jgrapht.util.UnorderedVertexPair.hashCode(
at java.util.HashMap.hash(
at java.util.HashMap.get(
at org.jgrapht.graph.specifics.FastLookupUndirectedSpecifics.getEdge(
at org.jgrapht.graph.AbstractBaseGraph.getEdge(
at org.jgrapht.alg.HopcroftKarpBipartiteMatching.symmetricDifference(
at org.jgrapht.alg.HopcroftKarpBipartiteMatching.maxMatching(
at org.jgrapht.alg.HopcroftKarpBipartiteMatching.(

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