我已经创建了一个Android应用程序并且它的工作正常。但是现在当我尝试在我的Android应用程序中登录时，它会显示日志cat错误，如：
>06-27 05:26:11.082: W/System.err(4308): org.json.JSONException: Value <!DOCTYPE of type java.lang.String
> cannot be converted to JSONObject
>06-27 05:26:11.092: W/System.err(4308): at org.json.JSON.typeMismatch(JSON.java:111)
>06-27 05:26:11.092: W/System.err(4308): at org.json.JSONObject.<init>(JSONObject.java:159)
>06-27 05:26:11.092: W/System.err(4308): at org.json.JSONObject.<init>(JSONObject.java:172)
>06-27 05:26:11.092: W/System.err(4308): at
> //ERROR DISPLAY IN BACKGROUND
> com.sunmobileappnow.mobileappnow.LoginActivity$SigIn.doInBackground(LoginActivity.java:446)
> 06-27 05:26:11.092: W/System.err(4308): at com.sunmobileappnow.mobileappnow.LoginActivity$SigIn.doInBackground(LoginActivity.java:1)
> 06-27 05:26:11.092: W/System.err(4308): at android.os.AsyncTask$2.call(AsyncTask.java:288)
> 06-27 05:26:11.092: W/System.err(4308): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
> 06-27 05:26:11.092: W/System.err(4308): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
> 06-27 05:26:11.092: W/System.err(4308): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
> 06-27 05:26:11.092: W/System.err(4308): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
> 06-27 05:26:11.092: W/System.err(4308): at java.lang.Thread.run(Thread.java:841)
>06-27 05:26:11.112: W/System.err(4308): java.net.MalformedURLException
>//ERROR DISPLAY ON URI
>06-27 05:26:11.112: W/System.err(4308): at java.net.URL.<init>(URL.java:152)
>06-27 05:26:11.112: W/System.err(4308): at java.net.URL.<init>(URL.java:125)
>06-27 05:26:11.112: W/System.err(4308): at com.sunmobileappnow.mobileappnow.LoginActivity$Images.OpenHttpConnection(LoginActivity.java:710)
>06-27 05:26:11.112: W/System.err(4308): at com.sunmobileappnow.mobileappnow.LoginActivity$Images.DownloadImage(LoginActivity.java:741)
>06-27 05:26:11.112: W/System.err(4308): at com.sunmobileappnow.mobileappnow.LoginActivity$Images.doInBackground(LoginActivity.java:665)
>06-27 05:26:11.112: W/System.err(4308): at com.sunmobileappnow.mobileappnow.LoginActivity$Images.doInBackground(LoginActivity.java:1)
>
> //ERROR DISPLAY ON aSYNCTASK
>06-27 05:26:11.112: W/System.err(4308): at android.os.AsyncTask$2.call(AsyncTask.java:288)
>06-27 05:26:11.122: W/System.err(4308): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
>06-27 05:26:11.122: W/System.err(4308): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
>06-27 05:26:11.122: W/System.err(4308): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
>06-27 05:26:11.122: W/System.err(4308): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
>06-27 05:26:11.122: W/System.err(4308): at java.lang.Thread.run(Thread.java:841)
>06-27 05:26:11.122: W/System.err(4308): java.net.MalformedURLException