java.lang.ArrayIndexOutOfBoundsException even after encoding a String in android app

in my app i am trying to send an email and password to an url and in return i use to get either success message or error message. When i hit the api the return data came as follows

10-07 18:09:41.209: ERROR Data ?Error: Email and password do not match. Please try again!
10-07 18:10:47.698: ERROR Error(6开发者_如何转开发363): java.lang.ArrayIndexOutOfBoundsException

the problem is because of the ? before the word Error

So i thought of encoding the return data in my code as follows

HttpResponse rsp = client.execute(get);
tmpstr = URLEncoder.encode(EntityUtils.toString(rsp.getEntity()),"utf-8"); 
Log.e("Data ",""+tmpstr);

i tried out in the above and below method

HttpResponse rsp = client.execute(get);
tmpstr = URLEncoder.encode(EntityUtils.toString(rsp.getEntity()),"utf-8"); 
Log.e("Data ",""+tmpstr);
String data = URLEncoder.encode(tmpstr,"UTF-8");
Log.e("returned dataaaaaaaaaaaaaaaaaaaaaaaaaa ",""+data);

In the both the codes i am getting the same error as follows

10-07 21:01:47.698: ERROR(6363): Data %EF%BB%BFError%3A+Email+and+password+do+not+match.+Please+try+again%21
10-07 21:01:47.698: ERROR(6363): java.lang.ArrayIndexOutOfBoundsException

how to solve this issue

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Are you sure you have to use URLEncoder to encode such error messages? I guess the URLEncoder expect some string formatted like URL, and the string that you pass doesn't looks like an url.

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The answer for this question is given by Maxim in the comments part. i have mentioned this here in order to close this question....