Bom dia, Pessoal.

Estou tentando salvar a chave de acesso do CT-e no MDF-e versão 3.0 e está dando seguinte erro. Alguém consegue me ajudar por favor.
Bom dia, Pessoal.
 
Estou tentando salvar a chave de acesso do CT-e no MDF-e versão 3.0 e está dando seguinte erro. Alguém consegue me ajudar por favor.
 
ull
java.lang.NullPointerException
                at br.gov.sp.fazenda.dsdf.view.mdfe.PnlMdfeInfDocumento.d(PnlMdfeInfDocumento.java:1579)
                at br.gov.sp.fazenda.dsdf.view.mdfe.PnlMdfeInfDocumento.fillGUI(PnlMdfeInfDocumento.java:1337)
                at br.gov.sp.fazenda.dsdf.view.mdfe.DigitarMdfeGUI.a(DigitarMdfeGUI.java:624)
                at br.gov.sp.fazenda.dsdf.view.mdfe.DigitarMdfeGUI.setMDFeTO(DigitarMdfeGUI.java:523)
                at br.gov.sp.fazenda.dsdf.controller.mdfe.ManterMdfeController.a(ManterMdfeController.java:156)
                at br.gov.sp.fazenda.dsdf.controller.mdfe.ManterMdfeController.a(ManterMdfeController.java:319)
                at br.gov.sp.fazenda.dsdf.controller.mdfe.ManterMdfeController.actionPerformed(ManterMdfeController.java:738)
                at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
                at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
                at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
                at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
                at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
                at java.awt.Component.processMouseEvent(Unknown Source)
                at javax.swing.JComponent.processMouseEvent(Unknown Source)
                at java.awt.Component.processEvent(Unknown Source)
                at java.awt.Container.processEvent(Unknown Source)
                at java.awt.Component.dispatchEventImpl(Unknown Source)
                at java.awt.Container.dispatchEventImpl(Unknown Source)
                at java.awt.Component.dispatchEvent(Unknown Source)
                at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
                at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
                at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
                at java.awt.Container.dispatchEventImpl(Unknown Source)
                at java.awt.Window.dispatchEventImpl(Unknown Source)
                at java.awt.Component.dispatchEvent(Unknown Source)
                at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
                at java.awt.EventQueue.access$500(Unknown Source)
                at java.awt.EventQueue$3.run(Unknown Source)
                at java.awt.EventQueue$3.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.awt.EventQueue$4.run(Unknown Source)
                at java.awt.EventQueue$4.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.awt.EventQueue.dispatchEvent(Unknown Source)
                at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
                at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
                at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
                at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
                at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
                at java.awt.EventDispatchThread.run(Unknown Source)