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I'm routing my first circuit and thought I would use FreeRoute.

When I tried to export my design to a DSN file I got the following error:

IO_ERROR: Multiple components have identical reference IDs of "1PIN".
from /builddir/build/BUILD/kicad-2012.01.19/pcbnew/specctra.cpp : ThrowIOError() : line 119
Unable to export, please fix and try again.

I've run the schematic and the PCB new design checkers and there were no problems listed.

I'm not sure what this message is telling me. I have a number of components and corresponding modules with a pin number one, but, each component and module has a different name.

???

I figured this out. I had four holes for mounting with the same name. I've changed the names to unique names and numbers and can now export a DSN file. However after I run autorouter and export a ses file and then try to import it into PCBNew I get an error:

IO_ERROR: Session file has 'reference' to non-existent component "Hole1"
from /builddir/build/BUILD/kicad-2012.01.19/pcbnew/specctra.cpp : ThrowIOError() : line 119
BOARD may be corrupted, do not save it.
Fix problem and try again.

I can see this is still related to my hole modules. I see it says component. Do I have to create a component in eeschema for the holes even if they are not connected to anything?