中文XML论坛--[求助]protege无法加载~~

不知道怎么回事，昨天一打开Protege的项目，就弹出一个窗口说：Load Project Errors：
java.lang.RuntimeException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect

STACKTRACE:

java.net.SocketException: java.net.ConnectException: Connection refused: connect

at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)

at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)

at com.mysql.jdbc.Connection.createNewIO(Connection.java:2569)

at com.mysql.jdbc.Connection.<init>(Connection.java:1485)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)

at java.sql.DriverManager.getConnection(Unknown Source)

at edu.stanford.smi.protege.storage.database.RobustConnection.setupConnection(Unknown Source)

at edu.stanford.smi.protege.storage.database.RobustConnection.<init>(Unknown Source)

at edu.stanford.smi.protege.storage.database.DatabaseFrameDb.<init>(Unknown Source)

at edu.stanford.smi.protege.storage.database.DatabaseKnowledgeBaseFactory.addFrameStore(Unknown Source)

at edu.stanford.smi.protege.storage.database.DatabaseKnowledgeBaseFactory.loadKnowledgeBase(Unknown Source)

at edu.stanford.smi.protegex.owl.database.OWLDatabaseKnowledgeBaseFactory.loadKnowledgeBase(OWLDatabaseKnowledgeBaseFactory.java:75)

at edu.stanford.smi.protege.storage.database.DatabaseKnowledgeBaseFactory.loadKnowledgeBase(Unknown Source)

at edu.stanford.smi.protege.model.Project.loadDomainKB(Unknown Source)

at edu.stanford.smi.protege.model.Project.createDomainKnowledgeBase(Unknown Source)

at edu.stanford.smi.protege.model.Project.<init>(Unknown Source)

at edu.stanford.smi.protege.model.Project.loadProjectFromURI(Unknown Source)

at edu.stanford.smi.protege.ui.ProjectManager.loadProjectFromURI(Unknown Source)

at edu.stanford.smi.protege.ui.ProjectManager.loadProject(Unknown Source)

at edu.stanford.smi.protege.ui.WelcomeDialog.doOpenProject(Unknown Source)

at edu.stanford.smi.protege.ui.WelcomeDialog.openButton_actionPerformed(Unknown Source)

at edu.stanford.smi.protege.ui.WelcomeDialog$4.actionPerformed(Unknown Source)

at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

at javax.swing.AbstractButton$ForwardActionEvents.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 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.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.Dialog$1.run(Unknown Source)

at java.awt.event.InvocationEvent.dispatch(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

** END NESTED EXCEPTION **

Last packet sent to the server was 0 ms ago.

at edu.stanford.smi.protege.storage.database.DatabaseFrameDb.createRuntimeException(Unknown Source)