A similar issue happened to me. Eventually a very close look at the map that I had downloaded from OSM revealed I somehow had missed a very tiny tile of the whole area I was interested in. I honestly believed I had selected them all when creating the map but no, I missed that little one. Hence there was discontinuity in routing, and the error message. I redid the OSM map creation routine and took extra care not missing any tiny tile by zooming in big time, and haven't had any problem with it since then.
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