java - Application has stops at the invocation of the webservice. Please help me to resolve this error -

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the application invokes webservice read user data , password stops go through invocation of web service, doing no wrong.

public webservice(context context) {     contexto= context; }  public arraylist login(string user, string password) {     string namespace = "http://tempuri.org/";     string url = "http://192.168.30.8/genera/genera.asmx";     string soap_action = "http://tempuri.org/login";     string method_name = "login";     arraylist unidades =new arraylist();      try { **//create request , envelope**         soapobject request = new soapobject(namespace, method_name);         soapserializationenvelope envelope = new soapserializationenvelope(soapenvelope.ver11);         request.addproperty("username", user.tolowercase());         request.addproperty("password", password.tolowercase());         envelope.dotnet = true;         envelope.enc = soapserializationenvelope.enc2003;                     envelope.setoutputsoapobject(request);         envelope.implicittypes = true;                    httptransportse ht = new httptransportse(url);             //involve web service         ht.setxmlversiontag("<?xml version=\"1.0\" encoding=\"utf-8\"?>");         ht.debug = true;         ht.call(soap_action, envelope);   **//in step, application stopped**          soapobject response = (soapobject) envelope.getresponse();         response = (soapobject)  response.getproperty(1);     }     catch (exception e) {         mensajebox(e.getmessage(),contexto);         return unidades;     } }


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