[GraphHopper] Exception Cannot load the graph - it wasn't create via com.graphhopper.storage.GraphStorage

[me at pgwelch.info]

Hi, 

I've been following the guide
https://github.com/graphhopper/graphhopper/wiki/Developers. I can build
a graph by calling this in cygwin: 

./graphhopper.sh web europe_germany_berlin.osm 

I then try loading it in code using: 

GraphHopperAPI gh = new GraphHopper().forServer();
gh.load("D:\Processing\Graphhopper\graphhopper\europe_germany_berlin-gh");


but it gives me this exception: 

Exception in thread "main" java.lang.IllegalStateException: Cannot load
the graph - it wasn't create via com.graphhopper.storage.GraphStorage!
D:ProcessingGraphhoppergraphhoppereurope_germany_berlin-gh/ 

which happens when it checks the first int from the header of the nodes
DataAccess object against the hashcode of the GraphStorage class name. 

What am I doing wrong? When you build a graph from the command line does
it create it using a different class, not GraphStorage? Or does Maven
somehow build GraphStorage into a different namespace? 

many thanks 

Phil 
 
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