[GraphHopper] App crashed getting response from GraphHopperAPI.rout(request)

[Awais Bin Asif]

I am trying to run the code Graphhopper-Android from
https://github.com/graphhopper/graphhopper-android using berlin-gh graph
file available at https://code.google.com/p/graphhopper/downloads/list

First i tried to load the .map file and it successfully loaded. it showed
the brelin's map

Then i took two parts of the code
PrepareGraph()
calcPath()

Prepare graph makes toast "*Finished loading graph. Touch to route*" thats
mean graph loaded successfully. in calcPath() function App crashed at

 GHResponse resp = hopper.route(req);  while getting response.

where hopper is *GraphHopperAPI hopper*;
and for request i hard coded the lat lon from map.

 Now i don't know the implementation of GraphHopperAPI.rout(req) so how can
i figure this out.
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