短信猫报错，请高手们帮助看看。感谢

Question

 0      2015-01-04 14:32:58,500 [WatchDog] ERROR cn.sendsms.modem.AModemDriver  - GTW: modem1: 端口启动时出现超时异常
cn.sendsms.TimeoutException: No response from device.
    at cn.sendsms.modem.AModemDriver$CharQueue.get(AModemDriver.java:875)
    at cn.sendsms.modem.AModemDriver.getResponse(AModemDriver.java:671)
    at cn.sendsms.modem.AModemDriver.getResponse(AModemDriver.java:364)
    at cn.sendsms.modem.athandler.ATHandler.getCCID(ATHandler.java:67)
    at cn.sendsms.modem.AModemDriver.connect(AModemDriver.java:153)
    at cn.sendsms.modem.ModemGateway.startGateway(ModemGateway.java:201)
    at cn.sendsms.modem.SerialModemGateway.startGateway(SerialModemGateway.java:93)
    at cn.sendsms.Service$WatchDog.process(Service.java:1622)
    at cn.sendsms.threading.AServiceThread.run(AServiceThread.java:105)
0      2015-01-04 14:32:58,500 [WatchDog] ERROR cn.sendsms.Service$WatchDog  - Error while starting Gateway: modem1
cn.sendsms.TimeoutException: No response from device.
    at cn.sendsms.modem.AModemDriver$CharQueue.get(AModemDriver.java:875)
    at cn.sendsms.modem.AModemDriver.getResponse(AModemDriver.java:671)
    at cn.sendsms.modem.AModemDriver.getResponse(AModemDriver.java:364)
    at cn.sendsms.modem.athandler.ATHandler.getCCID(ATHandler.java:67)
    at cn.sendsms.modem.AModemDriver.connect(AModemDriver.java:153)
    at cn.sendsms.modem.ModemGateway.startGateway(ModemGateway.java:201)
    at cn.sendsms.modem.SerialModemGateway.startGateway(SerialModemGateway.java:93)
    at cn.sendsms.Service$WatchDog.process(Service.java:1622)
    at cn.sendsms.threading.AServiceThread.run(AServiceThread.java:105)
0      2015-01-04 14:32:58,500 [WatchDog] ERROR cn.sendsms.threading.AServiceThread  - Error!
java.util.ConcurrentModificationException
    at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
    at java.util.AbstractList$Itr.next(Unknown Source)
    at cn.sendsms.Service$WatchDog.process(Service.java:1603)
    at cn.sendsms.threading.AServiceThread.run(AServiceThread.java:105)