SEVERE: AJP-0016 Category=6 Message=An I/O error occurred: null exceptionID=-1500293003-29
AJP-0016 Category=6 Message=An I/O error occurred: null exceptionID=-1500293003-29
        at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:337)
        at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.createResponse(AJPv13ConnectionImpl.java:227)
        at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13Task.java:352)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
        at java.util.concurrent.FutureTask.run(FutureTask.java:123)
        at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.runTask(CustomThreadPoolExecutor.java:750)
        at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:776)
        at java.lang.Thread.run(Thread.java:595)
Caused by: java.io.UnsupportedEncodingException: null
        at sun.io.Converters.getConverterClass(Converters.java:218)
        at sun.io.Converters.newConverter(Converters.java:251)
        at sun.io.CharToByteConverter.getConverter(CharToByteConverter.java:68)
        at java.lang.StringCoding.encode(StringCoding.java:374)
        at java.lang.String.getBytes(String.java:812)
        at com.openexchange.ajp13.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:544)
        at com.openexchange.ajp13.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:551)
        at com.openexchange.usm.eas.servlet.EASServlet.doPost(EASServlet.java:382)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:616)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doServletService(AJPv13RequestHandlerImpl.java:523)
        at com.openexchange.ajp13.AJPv13Request.response(AJPv13Request.java:134)
        at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:335)
        ... 7 more