I am trying to import my own graph, but the import fails.
Are there any minimal requirements / standards for the graph?
I have created my own osm file, converted it to pbf using osmconvert64.exe, then tried to rung graphhopper, but it fails with the error
ERROR [2019-05-29 18:05:21,602] io.dropwizard.cli.ServerCommand: Unable to start server, shutting down
! java.lang.IllegalStateException: graph is empty after in-place removal but was 6
! at com.graphhopper.storage.BaseGraph.inPlaceNodeRemove(BaseGraph.java:742)
! at com.graphhopper.storage.GraphHopperStorage.optimize(GraphHopperStorage.java:239)
! at com.graphhopper.routing.subnetwork.PrepareRoutingSubnetworks.doWork(PrepareRoutingSubnetworks.java:91)
! at com.graphhopper.GraphHopper.cleanUp(GraphHopper.java:1405)
! at com.graphhopper.GraphHopper.process(GraphHopper.java:671)
! at com.graphhopper.GraphHopper.importOrLoad(GraphHopper.java:641)
! at com.graphhopper.http.GraphHopperManaged.start(GraphHopperManaged.java:71)
The graph file is:<?xml version="1.0" encoding="UTF-8"?>