How to solve DynamicClassLoader exception

[Ferdhi Adrian]

i almost crazy about it,i spent a week but i cannot solve it

This is the error stack trace

[show] _jsp._index__jsp in DynamicClassLoader[SimpleLoader[/D:/NetBeansProjects/broadcast_new/transmitter/radar/webapps/WEB-INF/work]]

com.caucho.jsp.JspParseException: _jsp._index__jsp in DynamicClassLoader[SimpleLoader[/D:/NetBeansProjects/broadcast_new/transmitter/radar/webapps/WEB-INF/work]]
at com.caucho.jsp.JspCompilerInstance.compile(JspCompilerInstance.java:440)
at com.caucho.jsp.JspManager.compile(JspManager.java:241)
at com.caucho.jsp.JspManager.createPage(JspManager.java:170)
at com.caucho.jsp.JspManager.createPage(JspManager.java:149)
at com.caucho.jsp.PageManager.getPage(PageManager.java:248)
at com.caucho.jsp.PageManager.getPage(PageManager.java:178)
at com.caucho.jsp.PageManager.getPage(PageManager.java:161)
at com.caucho.jsp.QServlet.getSubPage(QServlet.java:295)
at com.caucho.jsp.QServlet.getPage(QServlet.java:210)
at com.caucho.server.dispatch.PageFilterChain.compilePage(PageFilterChain.java:238)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:145)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:270)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:678)
at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)
at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: _jsp._index__jsp in DynamicClassLoader[SimpleLoader[/D:/NetBeansProjects/broadcast_new/transmitter/radar/webapps/WEB-INF/work]]
at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1224)
at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1203)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.caucho.server.util.CauchoSystem.loadClass(CauchoSystem.java:422)
at com.caucho.jsp.JspCompiler.loadClass(JspCompiler.java:489)
at com.caucho.jsp.JspCompiler.loadPage(JspCompiler.java:462)
at com.caucho.jsp.JspCompilerInstance.compile(JspCompilerInstance.java:402)
... 17 more


Any help will be appreciated,many thanks and i'm so sorry for my bad English