serctl start had successed,but serctl moni didn't work

I type tail /var/log/messages, and get the error

someone know what happen?

 

Aug  2 18:55:21 knuth pppd[12282]: pppd 2.4.1 started by root, uid 0
Aug  2 18:55:21 knuth pppd[12282]: Couldn't get channel number: Input/output error
Aug  2 18:55:21 knuth pppd[12282]: Exit.
Aug  2 18:55:21 knuth init: Id "pd" respawning too fast: disabled for 5 minutes

this is my ser.cfg file

-----------------

#
# $Id: voicemail.cfg,v 1.2 2003/10/10 06:27:18 jiri Exp $
#
# this script is configured for use as voicemail UAS; it processes
# INVITEs and BYEs and asks SEMS to record media via "vm"; in this
# script, all record-routing and other constructs known from proxy
# scripts are not present  -- it is a simple UAS
#

 

# ----------- global configuration parameters ------------------------

 

#debug=                 # debug level (cmd line: -dddddddddd)
#fork=no
#log_stderror=yes       # (cmd line: -E)

 

check_via=no            # (cmd. line: -v)
dns=no                  # (cmd. line: -r)
rev_dns=no              # (cmd. line: -R)
port=5090
children=4
fifo="/tmp/vm_ser_fifo"

 

 

 

loadmodule "/usr/local/lib/ser/modules/mysql.so"
loadmodule "/usr/local/lib/ser/modules/sl.so"
loadmodule "/usr/local/lib/ser/modules/tm.so"
loadmodule "/usr/local/lib/ser/modules/rr.so"
loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/usrloc.so"
loadmodule "/usr/local/lib/ser/modules/registrar.so"
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/auth_db.so"
loadmodule "/usr/local/lib/ser/modules/vm.so"
loadmodule "/usr/local/lib/ser/modules/exec.so"

 

# ----------------- setting module-specific parameters ---------------

 

modparam("voicemail", "db_url","sql://ser:heslo@localhost/ser")

 

# -------------------------  request routing logic -------------------
# main routing logic

 

route{

 

        # initial sanity checks -- messages with
        # max_forwars==0, or excessively long requests
        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                break;
        };
        if (msg:len> max_len ) {
                sl_send_reply("513", "Message too big");
                break;
        };

 

        if (!uri==myself) {
                sl_send_reply("404", "not reponsible for host in r-uri");
                break;
        };

 

        # Voicemail specific configuration - begin

 

        if(method=="ACK" || method=="INVITE" || method=="BYE"){

 

                if (!t_newtran()) {
                        log("could not create new transaction\n");
                        sl_send_reply("500","could not create new transaction");
                        break;
                };

 

                t_reply("100","Trying -- just wait a minute !");
                if(method=="INVITE"){
                        log("**************** vm start - begin ******************\n");
                        if (uri=~"sip:as_welcome@.*" || uri=~"sip:as_nomoney@.*") {
                                if (!vm("/tmp/am_fifo", "announcement")) {
                                        log("couldn't contact announcement server\n");
                                        t_reply("500", "couldn not contact announcement server");
                                };
                                        t_reply("500", "couldn not contact announcement server");
                                };
                        } else {
                                if(!vm("/tmp/am_fifo","voicemail")){
                                        log("could not contact the answer machine\n");
                                        t_reply("500","could not contact the answer machine");
                                };
                        };
                        log("**************** vm start - end ******************\n");
                } else if(method=="BYE"){
                        log("**************** vm end - begin ******************\n");
                        if(!vm("/tmp/am_fifo","bye")){
                                log("could not contact the answer machine\n");
                                t_reply("500","could not contact the answer machine");
                        };
                        log("**************** vm end - end ******************\n");
                };
                break;
        };
        if (method=="CANCEL") {
                sl_send_reply("200", "cancels are junked here");
                break;
        };
        sl_send_reply("501", "method not understood here");

 

#};
#end of uri==myself
}