Eu estou fazendo este aplicativo que tem uma atividade que permite ao usuário efetuar login, o programa verifica as informações em um banco de dados e, em seguida, envia o usuário para a tela do painel. Tem funcionado perfeitamente, mas agora estou recebendo alguns erros estranhos que não consigo entender de onde eles vêm.

Aqui está o logcat:

01-18 14:54:22.160: E/AndroidRuntime(2621): FATAL EXCEPTION: AsyncTask #5
01-18 14:54:22.160: E/AndroidRuntime(2621): java.lang.RuntimeException: An error occured while executing doInBackground()
01-18 14:54:22.160: E/AndroidRuntime(2621):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.lang.Thread.run(Thread.java:856)
01-18 14:54:22.160: E/AndroidRuntime(2621): Caused by: java.lang.IllegalStateException: Target host must not be null, or set in parameters. scheme=null, host=null, path=192.168.0.2/android_login/
01-18 14:54:22.160: E/AndroidRuntime(2621):     at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:591)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:293)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at com.example.androidbasic12.library.JSONParser.getJSONFromUrl(JSONParser.java:42)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at com.example.androidbasic12.library.UserFunctions.loginUser(UserFunctions.java:40)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at com.example.androidbasic12.MainActivity$LoginTask.doInBackground(MainActivity.java:78)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at com.example.androidbasic12.MainActivity$LoginTask.doInBackground(MainActivity.java:1)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-18 14:54:22.160: E/AndroidRuntime(2621):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-18 14:54:22.160: E/AndroidRuntime(2621):     ... 4 more

Alguém que possa ver qual é o problema aqui?