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500 Servlet Exception

java.lang.IllegalArgumentException: illegal cookie name: 8�-'€�:
at javax.servlet.http.Cookie.<init>(Cookie.java:103)
at com.caucho.server.http.Request.fillCookie(Request.java:1145)
at com.caucho.server.http.Request.fillCookies(Request.java:1049)
at com.caucho.server.http.Request.getCookie(Request.java:1023)
at com.caucho.server.http.Request.findSessionIdFromCookie(Request.java:1284)
at com.caucho.server.http.Request.getRequestedSessionId(Request.java:1246)
at com.caucho.server.http.AbstractRequest.createSession(AbstractRequest.java:424)
at com.caucho.server.http.Request.getSession(Request.java:1186)
at com.caucho.jsp.QPageContext.initialize(QPageContext.java:124)
at com.caucho.jsp.QJspFactory.getPageContext(QJspFactory.java:79)
at _dirsearch__jsp._jspService(_dirsearch__jsp.java:21)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:506)
at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:344)
at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:274)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:534)

Resin 2.1.9 (built Tue Apr 15 14:28:40 PDT 2003)