android FATAL EXCEPTION: AsyncTask #2

i am coding android app but while using async task it is failing ,i have one async task and error is coming in it's doInBackground() method everything else looks good but doInBackground() method is not working properly . In doInBackground() method i have written the code for fetching the records from database while debugging i found that records are fetched in array-list but they are not geeting fed to

onPostExecute(String result) please help me out ...

private class LoadMoreAsync extends AsyncTask<Context, Void, String> {
    private String strAddress;

    public LoadMoreAsync(Context mContext,String strAddress) {
        /*this.strCardNo = strCardNo;
        this.strFirstName = strFirstName;
        this.strMiddleName = strMiddleName;*/
        this.strAddress = strAddress;
        /*this.strCardNo = strCardNo;*/
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        ToastUtils.showToast(mContext, "Loading More...");
    }

    @Override
    protected String doInBackground(Context... arg0) {
        mVoterArray = new ArrayList<AddressInfo>();
        mVoterArray = extDbUtil.getAddresslist(strAddress , limit += 20);
        if (mVoterArray.isEmpty() || mVoterArray == null)
            return null;
        else
            return "";
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
         IOUtils.stopLoading();
        if (result == null) {
            ToastUtils.showToast(mContext, "No Record Found!!");
        } else {
            int position = mListView.getLastVisiblePosition();
            mListAdapter = new ListAdapterNew2(mContext,
                    android.R.layout.simple_list_item_1, mVoterArray);
            mListView.setAdapter(mListAdapter);
            mListView.setSelectionFromTop(position, 0);
            mListAdapter.notifyDataSetChanged();
        }
    }
}

code for extDbUtil.getAddresslist(strAddress , limit += 20); method is

public ArrayList<AddressInfo> getAddresslist(String strAddress,int limit) {
    open();
    ArrayList<AddressInfo> mAddressArray = new ArrayList<AddressInfo>();
    String mQuery = "SELECT Address1,TotalMale,TotalFemale,TotalVoters, SrNo  FROM "
            + TABLE_ADDRESS;
    String Where = "";
    if (!strAddress.equals("NA")) {
        Where = " WHERE EAddress1 Like '%" + strAddress + "%'";

    }
    Log.i("SearchQuery", mQuery + Where + " LIMIT " + limit);
    Cursor mCursor = mDatabase.rawQuery(mQuery + Where + " LIMIT " + limit,
            null);

    if (mCursor != null) {
        if (mCursor.moveToFirst()) {                
            do {
                AddressInfo mAddress = new AddressInfo();
                mAddress.setSrNO(mCursor.getString(mCursor
                        .getColumnIndex("SrNo")));
                mAddress.setAddress(mCursor.getString(mCursor
                        .getColumnIndex("Address1")));
                mAddress.setTotalMale(mCursor.getString(mCursor
                        .getColumnIndex("TotalMale")));
                mAddress.setTotalFemal(mCursor.getString(mCursor
                        .getColumnIndex("TotalFemale")));
                mAddress.setTotalVoter(mCursor.getString(mCursor
                        .getColumnIndex("TotalVoters")));                   

            } while (mCursor.moveToNext());
            }


    }
    mCursor.close();
    CleanUp();
    return mAddressArray;
}

coming error is

01-03 22:59:05.310: D/memalloc(15369): ion: Mapped buffer base:0x51d44000 size:4096 offset:0 fd:87

01-03 22:59:05.310: I/SearchQuery(15369): SELECT Address1,TotalMale,TotalFemale,TotalVoters, SrNo FROM Addresses WHERE EAddress1 Like '%R%' LIMIT 20 01-03 22:59:05.330: W/dalvikvm(15369): threadid=16: thread exiting with uncaught exception (group=0x41a09600) 01-03 22:59:05.340: D/memalloc(15369): ion: Mapped buffer base:0x555da000 size:196608 offset:0 fd:84 01-03 22:59:05.340: D/memalloc(15369): ion: Mapped buffer base:0x51d4b000 size:4096 offset:0 fd:90 01-03 22:59:05.340: E/AndroidRuntime(15369): FATAL EXCEPTION: AsyncTask #3 01-03 22:59:05.340: E/AndroidRuntime(15369): java.lang.RuntimeException: An error occured while executing doInBackground() 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.os.AsyncTask$3.done(AsyncTask.java:299) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.lang.Thread.run(Thread.java:864) 01-03 22:59:05.340: E/AndroidRuntime(15369): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.os.Handler.(Handler.java:121) 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.widget.Toast$TN.(Toast.java:322) 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.widget.Toast.(Toast.java:91) 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.widget.Toast.makeText(Toast.java:238) 01-03 22:59:05.340: E/AndroidRuntime(15369): at com.phoenix.rajtantra.SearchByAdd$List_Async.doInBackground(SearchByAdd.java:284) 01-03 22:59:05.340: E/AndroidRuntime(15369): at com.phoenix.rajtantra.SearchByAdd$List_Async.doInBackground(SearchByAdd.java:1) 01-03 22:59:05.340: E/AndroidRuntime(15369): at android.os.AsyncTask$2.call(AsyncTask.java:287) 01-03 22:59:05.340: E/AndroidRuntime(15369): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 01-03 22:59:05.340: E/AndroidRuntime(15369): ... 5 more 01-03 22:59:05.540: D/memalloc(15369): ion: Mapped buffer base:0x5570a000 size:1536000 offset:0 fd:92 01-03 22:59:05.540: D/memalloc(15369): ion: Mapped buffer base:0x53c33000 size:4096 offset:0 fd:94