The error seems to be a generic error when the dialog code fails.

The script seems to assume the runtime is in the Poser program folder e.g

program files/e frontier/poser 7/runtime/libraries/pose   which may be wrong for PP2012.

It is writing an xml file which is then used for the dialog.   that is being put in  runtime/ui/spawncharactertext.xml

You could check if that file has been written.