求助：weblogic8.1 : Error 500--Internal Server Error

Error 500--Internal Server Error
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.

上面的是访问时出现的浏览器页面显示的内容。

下面的是访问时在启动平台上显示的信息：

.........................

<2008-7-23 上午11时03分03秒 CST> WebLogic Admin Server "skjserver" for domain "skskj" running in Production Mode
>
<2008-7-23 上午11时03分03秒 CST> started in RUNNING mode>
<2008-7-23 上午11时03分03秒 CST> me: 62ef5c178c47498, maps to multiple IP addresses:192.168.8.*,192.168.226.1,1
92.168.116.1>
<2008-7-23 上午11时03分03秒 CST> "SSLListenThread.Default" listening on port 7002, ip address 192.168.8.*>
<2008-7-23 上午11时03分03秒 CST> me: 62ef5c178c47498, maps to multiple IP addresses:192.168.8.*,192.168.226.1,1
92.168.116.1>
<2008-7-23 上午11时03分03秒 CST> "ListenThread.Default" listening on port 7001, ip address 192.168.8.*>
<2008-7-23 上午11时03分37秒 CST> <[ServletContext(id
=374929,name=skskj,context-path=)] Servlet failed with IOException
java.io.FileNotFoundException: null\sysinfo.txt (系统找不到指定的路径。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.(FileInputStream.java:106)
at java.io.FileReader.(FileReader.java:55)
at jsp_servlet._login.mainmodule._jspService(mainmodule.java:206)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run
(ServletStubImpl.java:1072)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:465)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:526)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:348)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationActio
n.run(WebAppServletContext.java:6981)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Authenticate
dSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:
121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java:3892)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:2766)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)

请各位大侠帮忙！ 谢谢！！期待回复。
[该贴被baojian于2008-07-23 11:35修改过]
[该贴被baojian于2008-07-23 11:37修改过]