Erro na assinatura do NFE 4.01

Boa tarde a todos, por favor poderia me ajudar, estou fazendo uma nota fiscal no emissor gratuito na hora que vou assinar com o certificado da um erro! Alguém sabe resolver este erro?

Ocorreu um problema durante a assinatura. Verificar se o Certificado Digital é válido.
br.gov.sp.fazenda.dsge.certif.exception.DSGECertificadoException: Ocorreu um problema durante a assinatura. Verificar se o Certificado Digital é válido.
at br.gov.sp.fazenda.dsge.certif.Certificado.assinarXML(Certificado.java:912)
at br.gov.sp.fazenda.dsge.certif.Certificado.assinarXML(Certificado.java:840)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness.assinar(NotaFiscalBusiness.java:152)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b.CGLIB$assinar$2(<generated>)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b$$FastClassByCGLIB$$9e5c0df3.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:167)
at br.gov.sp.fazenda.dsge.model.dao.util.DSGEDAOInterceptorHelper.intercept(DSGEDAOInterceptorHelper.java:55)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b.assinar(<generated>)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness.assinar(NotaFiscalBusiness.java:201)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b.CGLIB$assinar$3(<generated>)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b$$FastClassByCGLIB$$9e5c0df3.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:167)
at br.gov.sp.fazenda.dsge.model.dao.util.DSGEDAOInterceptorHelper.intercept(DSGEDAOInterceptorHelper.java:66)
at br.gov.sp.fazenda.dsen.model.business.NotaFiscalBusiness$$EnhancerByCGLIB$$1543c60b.assinar(<generated>)
at br.gov.sp.fazenda.dsen.model.facade.NotaFiscalFacade.assinarNotaFiscal(NotaFiscalFacade.java:346)
at br.gov.sp.fazenda.dsen.controller.PesquisarNotaFiscalController.e(PesquisarNotaFiscalController.java:664)
at br.gov.sp.fazenda.dsen.controller.PesquisarNotaFiscalController.actionPerformed(PesquisarNotaFiscalController.java:872)
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$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.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)

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