图纸为什么传不上来

今天试了N次,都传不上图纸啊!每次都是下面的提示:
500 Servlet Exception
java.lang.NoClassDefFoundError
at com.caucho.jsp.JspCompilerInstance.init(JspCompilerInstance.java:329)
at com.caucho.jsp.JspCompiler.getCompilerInstance(JspCompiler.java:381)
at com.caucho.jsp.JspManager.compile(JspManager.java:207)
at com.caucho.jsp.JspManager.createPage(JspManager.java:157)
at com.caucho.jsp.JspManager.createPage(JspManager.java:137)
at com.caucho.jsp.PageManager.getPage(PageManager.java:235)
at com.caucho.jsp.PageManager.getPage(PageManager.java:153)
at com.caucho.jsp.QServlet.getSubPage(QServlet.java:292)
at com.caucho.jsp.QServlet.getPage(QServlet.java:210)
at com.caucho.server.dispatch.PageFilterChain.compilePage(PageFilterChain.java:186)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:123)
at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:188)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:163)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:208)
at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:396)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:363)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:490)
at com.caucho.util.ThreadPool.run(ThreadPool.java:423)
at java.lang.Thread.run(Thread.java:595)


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本人对网络和英文比较"陌生".知道的能给我讲解一下吗?