java.lang.Error: Unresolved compilation problem: The return types are incompatible for the inherited methods Vertex.getVertexIdsOfPredecessors(), AbstractVertex.getVertexIdsOfPredecessors()

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Unresolved compilation problem: The return types are incompatible for the inherited methods Vertex.getVertexIdsOfPredecessors(), AbstractVertex.getVertexIdsOfPredecessors()
java.lang.Error: Unresolved compilation problem: The return types are incompatible for the inherited methods Vertex.getVertexIdsOfPredecessors(), AbstractVertex.getVertexIdsOfPredecessors()
at com.signalcollect.javaapi.DataFlowVertex.(DataFlowVertex.java:33)

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