applet程序做签名、编译都没有问题，但是一通过ie访问就会报下面的错：
java.io.IOException:   Invalid   keystore   format
at   sun.security.provider.JavaKeyStore.engineLoad(Unknown   Source)
at   sun.security.provider.JavaKeyStore$JKS.engineLoad(Unknown   Source)
at   java.security.KeyStore.load(Unknown   Source)
at   com.sun.deploy.security.DeploySigningCertStore$1.run(Unknown   Source)
at   java.security.AccessController.doPrivileged(Native   Method)
at   com.sun.deploy.security.DeploySigningCertStore.loadCertStore(Unknown   Source)
at   com.sun.deploy.security.DeploySigningCertStore.load(Unknown   Source)
at   com.sun.deploy.security.DeploySigningCertStore.load(Unknown   Source)
at   com.sun.deploy.panel.CertificatesInfo.reset(Unknown   Source)
at   com.sun.deploy.panel.CertificatesInfo. <init> (Unknown   Source)
at   com.sun.deploy.panel.CertificatesDialog. <init> (Unknown   Source)
at   com.sun.deploy.panel.SecurityPanel.certsBtnActionPerformed(Unknown   Source)
at   com.sun.deploy.panel.SecurityPanel.access$000(Unknown   Source)
at   com.sun.deploy.panel.SecurityPanel$1.actionPerformed(Unknown   Source)
at   javax.swing.AbstractButton.fireActionPerformed(Unknown   Source)
at   javax.swing.AbstractButton$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.AWTEventMulticaster.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.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)
请问如何解决？