Tomcat错误，困扰了我好几天了

严重: Error deploying configuration descriptor wkfapp.xml
java.io.IOException: 设备未就绪。
        at java.io.WinNTFileSystem.canonicalize0(Native Method)
        at java.io.Win32FileSystem.canonicalize(Win32FileSystem.java:396)
        at java.io.File.getCanonicalPath(File.java:559)
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.ja
va:610)
        at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.j
ava:553)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488
)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1206)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:293)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:117)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1337)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1601)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1610)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)
2008-10-23 10:57:26 org.apache.catalina.startup.HostConfig deployDescriptor