cannot link the libMapView.a to my project

I have tried to import the mapview as a sub project, I have linked the library in main project's build phases "target dependencies" and in "link with libraries" however I am getting the error

"Undefined symbols for architecture arm7:
"_RMTileDummy", referanced from
-[RMFractalTileProjection normaliseTile:] in libMapView.a(RMfractalTileProjection.0)

..... and there is more, is there a probelm with this or have I messed this up?