java.lang.IllegalArgumentException: Unexpected edge type.

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java.lang.IllegalArgumentException: Unexpected edge type.
at scalax.collection.GraphEdge$EqDiHyper$class.baseEquals(GraphEdge.scala:337)
at scalax.collection.edge.LDiHyperEdge.baseEquals(HyperEdges.scala:87)
at scalax.collection.edge.LkBase$LkEdge$class.equals(Base.scala:242)
at scalax.collection.edge.LkDiHyperEdge.equals(HyperEdges.scala:121)
at scalax.collection.GraphEdge$EdgeLike$class.equals(GraphEdge.scala:216)
at scalax.collection.GraphEdge$HyperEdge.equals(GraphEdge.scala:518)
at scalax.collection.immutable.AdjacencyListBase$EdgeSet$$anonfun$find$1$$anonfun$apply$9.apply(AdjacencyListBase.scala:254)
at scalax.collection.immutable.AdjacencyListBase$EdgeSet$$anonfun$find$1$$anonfun$apply$9.apply(AdjacencyListBase.scala:254)
at scala.collection.Iterator$class.find(Iterator.scala:796)
at scala.collection.AbstractIterator.find(Iterator.scala:1195)
at scala.collection.IterableLike$class.find(IterableLike.scala:79)
at scalax.collection.mutable.SimpleArraySet.find(SimpleArraySet.scala:22)
at scalax.collection.immutable.AdjacencyListBase$EdgeSet$$anonfun$find$1.apply(AdjacencyListBase.scala:254)
at scalax.collection.immutable.AdjacencyListBase$EdgeSet$$anonfun$find$1.apply(AdjacencyListBase.scala:254)
at scala.Option.flatMap(Option.scala:170)
at scalax.collection.immutable.AdjacencyListBase$EdgeSet$class.find(AdjacencyListBase.scala:254)
at scalax.collection.mutable.AdjacencyListGraph$EdgeSet.find(AdjacencyListGraph.scala:120)
at scalax.collection.GraphLike$class.find(Graph.scala:228)
at scalax.collection.mutable.DefaultGraphImpl.find(Graph.scala:264)
at scalax.collection.GraphLike$class.get(Graph.scala:244)
at scalax.collection.mutable.DefaultGraphImpl.get(Graph.scala:264)

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