500 Servlet Exception

[show] java.lang.IllegalStateException: sendError() forbidden after buffer has
been committed.

java.lang.IllegalStateException: sendError() forbidden after buffer has
been committed.
	at com.caucho.server.connection.AbstractHttpResponse.sendError(AbstractHttpResponse.java:492)
	at com.caucho.server.connection.AbstractHttpResponse.sendError(AbstractHttpResponse.java:473)
	at com.caucho.servlets.FileServlet.service(FileServlet.java:246)
	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:283)
	at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:115)
	at com.caucho.jsp.PageContextImpl.handlePageException(PageContextImpl.java:1162)
	at _jsp._everquest._buy_22deverquest_22dplatinum__jsp._jspService(_buy_22deverquest_22dplatinum__jsp.java:120)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
	at com.caucho.jsp.Page.pageservice(Page.java:578)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195)
	at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:194)
	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(Thread.java:595)