title: log4j:WARN Please initialize the log4j system properly
body: <p>How to resolve these following errors... Am I missing some jar file???    </p>
  
  <pre><code>log4j:WARN No appenders could be found for logger (smslib).
      log4j:WARN Please initialize the log4j system properly.
  
  
  
  org.smslib.GatewayException: Comm library exception: java.lang.RuntimeException: javax.comm.PortInUseException: Port currently owned by Unknown Windows Application
          at org.smslib.modem.SerialModemDriver.connectPort(SerialModemDriver.java:97)
          at org.smslib.modem.AModemDriver.connect(AModemDriver.java:110)
          at org.smslib.modem.ModemGateway.startGateway(ModemGateway.java:158)
          at org.smslib.Service$1Starter.run(Service.java:252)
  
  
  WaitCommEvent: Error 31
  WaitCommEvent: Error 31
  </code></pre>