我已经安装了 Pentaho v5.4，它首先可以工作。但是今天我从中得到了错误。我不知道如何解决这个错误。谁能帮我解决这个错误？窗口显示如下，
org.pentaho.di.core.exception.KettleXMLException:
Error reading object from XML file
Maximum wait time of 10 seconds exceed while acquiring lock
at org.pentaho.di.trans.TransMeta.loadXML(TransMeta.java:3361)
at org.pentaho.di.ui.spoon.TransFileListener.open(TransFileListener.java:51)
at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:4550)
at org.pentaho.di.ui.spoon.Spoon.loadLastUsedFile(Spoon.java:8108)
at org.pentaho.di.ui.spoon.Spoon.loadLastUsedFiles(Spoon.java:7871)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:7895)
at org.pentaho.di.ui.spoon.Spoon.createContents(Spoon.java:9174)
at org.eclipse.jface.window.Window.create(Window.java:426)
at org.eclipse.jface.window.Window.open(Window.java:785)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9189)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:654)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)
Caused by: org.pentaho.metastore.api.exceptions.MetaStoreException: Maximum wait time of 10 seconds exceed while acquiring lock
at org.pentaho.metastore.stores.xml.XmlMetaStore.lockStore(XmlMetaStore.java:659)
at org.pentaho.metastore.stores.xml.XmlMetaStore.getElementTypes(XmlMetaStore.java:171)
at org.pentaho.metastore.stores.xml.XmlMetaStore.getElementTypes(XmlMetaStore.java:165)
at org.pentaho.metastore.stores.delegate.DelegatingMetaStore.getElementTypes(DelegatingMetaStore.java:203)
at org.pentaho.metastore.stores.delegate.DelegatingMetaStore.getElementTypeByName(DelegatingMetaStore.java:234)
at org.pentaho.di.base.AbstractMeta.importFromMetaStore(AbstractMeta.java:402)
at org.pentaho.di.trans.TransMeta.loadXML(TransMeta.java:2921)
... 15 more
提前致谢