A valid String cant be converted to JSONObject using volley - android

I am reading some inforamtion from database as json object .
the database returns a well formated string ( as json object ) .
When i try to convert the string to jsonObject .. it returns null
here is the string from database :
{"items":[{"title":"Police","icon":"police","type":"normal","tel":"999"},{"title":"Ambulance","icon":"ambulance","type":"normal","tel":"976"},{"title":"Electricity","icon":"electricity","type":"normal","tel":"4848"},{"title":"Fire Station","icon":"fire","type":"normal","tel":"998"},{"title":"Airport Information 1","icon":"airport","type":"normal","tel":"0183447405"},{"title":"Airport Information 2","icon":"airport","type":"normal","tel":"0183780129"},{"title":"Water","icon":"water","type":"normal","tel":"3131"}],"success":1}
and here the response error from logcat :
12-18 20:24:44.529: W/System.err(25062): org.json.JSONException: Value of type java.lang.String cannot be converted to JSONObject
as you can see it indicate that the string value is empty ... while the logcat shows me my string ....
Please note that this code was working very well before ..
EDIT :
I tried the same code to read from different database . and it worked well
i guess its database error .

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Problem is on this line
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I'm calling a web service from my Android application. The web service returns the following JSON :
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According to me,
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I have to send HttpRequest to server using api in this manner.
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Why do I get this error in my logcat when I try to post JSON data?

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Try this.
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if (Jobj.has("success")) {
success = Jobj.getString("success");
}

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I know this question has been asked a number of times but I didn't find any relative answer of my question.
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I searched number of stuffs but didn't help. Please give me any reference or hint.
Thanks in Advance.

Use
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instead of
JSONObject searchedTerm = jsonObject.getJSONObject(TAG_SEARCHEDTERM);
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I guess you need to get the Dish Name where you are getting exception.
You can get the dish name shown below...
String searchedTerm = jsonObject.getString(TAG_SEARCHEDTERM);
Using this
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you will get the "results" JSONArray as shown in your json file.
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