UG10.0帮助文档无法使用的重要原因（比如：不能显示帮助信息500错误、无法显示此页）

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HTTP ERROR 500
Problem accessing /tdoc/nx/10/nx_help/. Reason:

    Server Error

Caused by:
org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP

PWC6199: Generated servlet error:
The type java.io.ObjectInputStream cannot be resolved. It is indirectly referenced from required .class files


        at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:129)
        at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:299)
        at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:392)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:453)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:492)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:378)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
我的帮助文档打开是出现上面的情况，看不懂是什么意思，谁知道，指点一二，谢谢