[Gvsig_usuarios] Error en Sextante (proceso Crear Reticula)

[Arqueomarco]

Hola!:

             he tenido un pequeño problema en Gvsig con Sextante. resulta
que pido hacer una reticula de 50 x 50 en un territorio de alrededor de 60
km2. Me sale el icono de la capa, pero no aparece NADA en la vista. Probé
haciendolo por rectángulos (lo que necesito), lineas y puntos. Ninguno me
aparece. Porfavor Ayuden, ya que estoy sin el trabajo entregado por causa
del famoso Bug. Aqui va la info de la Consola. Gracias de antemano

Error no capturado por el usuario java.lang.NullPointerException: null
    com.iver.cit.gvsig.fmap.layers.FLyrVect.getShapeType(Unknown Source)
    com.iver.cit.gvsig.graph.GenerateNetworkExtension.isVisible(GenerateNetworkExtension.java:446)
    com.iver.andami.plugins.ExtensionDecorator.isVisible(Unknown Source)
    com.iver.andami.ui.mdiFrame.MDIFrame.enableControls(Unknown Source)
    com.iver.cit.gvsig.project.documents.view.toc.gui.TOC$NodeSelectionListener.mouseClicked(Unknown
Source)     java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
    java.awt.Component.processMouseEvent(Unknown Source)
    javax.swing.JComponent.processMouseEvent(Unknown Source)
    java.awt.Component.processEvent(Unknown Source)
    java.awt.Container.processEvent(Unknown Source)
    java.awt.Component.dispatchEventImpl(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    java.awt.Container.dispatchEventImpl(Unknown Source)
    java.awt.Window.dispatchEventImpl(Unknown Source)
    java.awt.Component.dispatchEvent(Unknown Source)
    java.awt.EventQueue.dispatchEvent(Unknown Source)
    com.iver.andami.ui.AndamiEventQueue.dispatchEvent(Unknown Source)
    java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    java.awt.EventDispatchThread.run(Unknown Source) 
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