500 Servlet Exception

java.lang.IllegalStateException: can't clear response after writing headers
	at com.caucho.server.http.ResponseStream.clear(ResponseStream.java:201)
	at com.caucho.server.http.Response.reset(Response.java:1255)
	at com.caucho.server.http.Response.reset(Response.java:1237)
	at com.caucho.jsp.QJspWriter.clear(QJspWriter.java:235)
	at _bbs._bbs._bbs__jsp._jspService(/usr/local/resin/doc/bbs/bbs/bbs.jsp:669)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:485)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:312)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:342)
	at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:272)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
	at java.lang.Thread.run(Thread.java:536)