Patch to the [gvsig-install-folder]/gvSIG/extensiones/org.gvsig.scripting.extension/scripting/lib/gvsig.py

In the header of file, add the import:

from org.gvsig.fmap.mapcontext.layers.vectorial import FLyrVect

In the method "getLayer" of class "View", the last lines should be

ls = self.getLayers()
for i in xrange(ls.getLayersCount()):
  l = ls.getLayer(i)
  if l.name == name:
     if isinstance(layer, FLyrVect):
      return Layer(l)
     else:
      return l

return None

Changed the "return Layer(l)" by a "if" with a "isinstance".

Care with the indentation!

Whenever you modify this file you must restart gvSIG for the changes to take effect