salve a tutti,

ho 1 piccolo problema con firefox: non riesco ad inviare sms con il servizio offerto da tiscali. Ho provato a disattivare l'adblock, il firewall,ma...ecco che errore mi esce: (cosa può essere a causarlo??)

Error: 500
Location: /sms4/sms.jsp
Internal Servlet Error:

javax.servlet.ServletException
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.(Compiled Code)
at java.lang.Exception.(Compiled Code)
at javax.servlet.ServletException.(Compiled Code)
at org.apache.jasper.runtime.PageContextImpl.handlePa geException(Compiled Code)
at _0002fsms_0002ejspsms_jsp_5._jspService(Compiled Code)
at org.apache.jasper.runtime.HttpJspBase.service(Comp iled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet$JspCountedSer vlet.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet$JspServletWra pper.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(Compiled Code)
at org.apache.jasper.servlet.JspServlet.service(Compi led Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.doService(Co mpiled Code)
at org.apache.tomcat.core.Handler.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.service(Comp iled Code)
at org.apache.tomcat.core.ContextManager.internalServ ice(Compiled Code)
at org.apache.tomcat.core.ContextManager.service(Comp iled Code)
at org.apache.tomcat.service.connector.Ajp13Connectio nHandler.processConnection(Compiled Code)
at org.apache.tomcat.service.TcpWorkerThread.runIt(Co mpiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable. run(Compiled Code)
at java.lang.Thread.run(Compiled Code)

Root cause:

java.lang.NullPointerException
at java.lang.String.indexOf(Compiled Code)
at _0002fsms_0002ejspsms_jsp_5.ControlloUsername(Comp iled Code)
at _0002fsms_0002ejspsms_jsp_5._jspService(Compiled Code)
at org.apache.jasper.runtime.HttpJspBase.service(Comp iled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet$JspCountedSer vlet.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet$JspServletWra pper.service(Compiled Code)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(Compiled Code)
at org.apache.jasper.servlet.JspServlet.service(Compi led Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.doService(Co mpiled Code)
at org.apache.tomcat.core.Handler.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.service(Comp iled Code)
at org.apache.tomcat.core.ContextManager.internalServ ice(Compiled Code)
at org.apache.tomcat.core.ContextManager.service(Comp iled Code)
at org.apache.tomcat.service.connector.Ajp13Connectio nHandler.processConnection(Compiled Code)
at org.apache.tomcat.service.TcpWorkerThread.runIt(Co mpiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable. run(Compiled Code)
at java.lang.Thread.run(Compiled Code)