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java.lang.NullPointerException: 	at com.graphhopper.routing.util.AbstractFlagEncoder.flagsDefault(AbstractFlagEncoder.java:282)	at com.graphhopper.routing.util.EncodingManager.flagsDefault(EncodingManager.java:305)	at com.graphhopper.storage.BaseGraph.edge(BaseGraph.java:324)	at com.graphhopper.storage.GraphHopperStorage.edge(GraphHopperStorage.java:364)	at com.graphhopper.reader.dem.TunnelElevationInterpolatorTest.interpolatesElevationOfTunnelWithTwoOuterNodes(TunnelElevationInterpolatorTest.java:148)