Please help: strange android error i dont know further

Hello today i was trying to code a ListView and in it says data from a database and them i tested it i was sure it will work this time and them this weird error comes up my logcat:

Code:

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10-09 20:53:38.166: E/AndroidRuntime(279): FATAL EXCEPTION: main
10-09 20:53:38.166: E/AndroidRuntime(279): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:347)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.AbsListView.obtainView(AbsListView.java:1315)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.ListView.measureHeightOfChildren(ListView.java:1198)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.ListView.onMeasure(ListView.java:1109)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.View.measure(View.java:8171)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.RelativeLayout.measureChild(RelativeLayout.java:563)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:378)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.View.measure(View.java:8171)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.View.measure(View.java:8171)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.View.measure(View.java:8171)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.os.Handler.dispatchMessage(Handler.java:99)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.os.Looper.loop(Looper.java:123)
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.app.ActivityThread.main(ActivityThread.java:4627)
10-09 20:53:38.166: E/AndroidRuntime(279):        at java.lang.reflect.Method.invokeNative(Native Method)
10-09 20:53:38.166: E/AndroidRuntime(279):        at java.lang.reflect.Method.invoke(Method.java:521)
10-09 20:53:38.166: E/AndroidRuntime(279):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-09 20:53:38.166: E/AndroidRuntime(279):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-09 20:53:38.166: E/AndroidRuntime(279):        at dalvik.system.NativeStart.main(Native Method)
10-09 20:53:38.166: E/AndroidRuntime(279): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout
10-09 20:53:38.166: E/AndroidRuntime(279):        at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:340)
10-09 20:53:38.166: E/AndroidRuntime(279):        ... 24 more

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and my main.java code is:

Code:

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package com.example.frauprinzssapp;


import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends Activity {
       
       
        private static String DDB_NAME = dbreader.FeedEntry.DB_TABLENAME;
        SQLiteDatabase db;
       
        List<String> userss = new ArrayList<String>();
       
        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                database Mydb = new database(Main.this);
                db = Mydb.getWritableDatabase();
                String[] t = null;
               
               
                ListView users = (ListView) findViewById(R.id.users);
               
                try{
                        String query = "SELECT * FROM "+DDB_NAME+" ORDER BY "+dbreader.FeedEntry.COL_1+" DESC";
                        Cursor c = db.rawQuery(query, t);
                       
                        while (c.moveToNext()){
                                if (c.moveToLast()){
                                        userss.add(c.toString());
                                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(Main.this, R.layout.main, userss);
                                        users.setAdapter(adapter);
                                        return;
                                }
                                userss.add(c.toString());
                        }
                }catch(Exception e){
                        userss.add("[ERRORMSG]: "+e.getMessage());
                        userss.add("[ERRORCAUSE]: "+e.getCause());
                        userss.add("[ERRORLOC]: "+e.getLocalizedMessage());
                        userss.add("[CLASS]: "+e.getClass());
                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(Main.this, R.id.users, userss);
                        users.setAdapter(adapter);
                }
        }
        //-----change view voids-----
        public void main(View view){
                setContentView(R.layout.main);
        }
        public void adduser(View view){
                setContentView(R.layout.adduser);
        }
        public void removeuser(View view){
                setContentView(R.layout.removeuser);
        }
       
        //------actions------
        public void add(View view){
                EditText name = (EditText) findViewById(R.id.aun);
                EditText clas = (EditText) findViewById(R.id.auc);
                String namee = name.getText().toString();
                String  clase =  clas.getText().toString();
               
                if (name.toString() == null || clas.toString() == null){
                        Toast.makeText(Main.this, "please fill in all textfields!", Toast.LENGTH_LONG);
                        return;
                }
                ContentValues values = new ContentValues();
                values.put(dbreader.FeedEntry.COL_2, namee);
                values.put(dbreader.FeedEntry.COl_3, clase);
                values.put(dbreader.FeedEntry.COL_4, 0);
               
        try{
                db.insert(DDB_NAME, null, values);
                Toast.makeText(Main.this, "added user "+name.toString()+"!", Toast.LENGTH_LONG);
                setContentView(R.layout.main);
        }catch(Exception e){
                Toast.makeText(Main.this, "[ERROR] Could not create user maybe its already created!", Toast.LENGTH_LONG);
                e.printStackTrace();
        }
        }
        public void remove(){
               
        }
        public void show(){
               
        }
}

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the part where this is coming from is (i tihnk):

Code:

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                database Mydb = new database(Main.this);
                db = Mydb.getWritableDatabase();
                String[] t = null;
               
               
                ListView users = (ListView) findViewById(R.id.users);
               
                try{
                        String query = "SELECT * FROM "+DDB_NAME+" ORDER BY "+dbreader.FeedEntry.COL_1+" DESC";
                        Cursor c = db.rawQuery(query, t);
                       
                        while (c.moveToNext()){
                                if (c.moveToLast()){
                                        userss.add(c.toString());
                                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(Main.this, R.layout.main, userss);
                                        users.setAdapter(adapter);
                                        return;
                                }
                                userss.add(c.toString());
                        }
                }catch(Exception e){
                        userss.add("[ERRORMSG]: "+e.getMessage());
                        userss.add("[ERRORCAUSE]: "+e.getCause());
                        userss.add("[ERRORLOC]: "+e.getLocalizedMessage());
                        userss.add("[CLASS]: "+e.getClass());
                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(Main.this, R.id.users, userss);
                        users.setAdapter(adapter);
                }

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and also can you tell me if the ordering and displaying to the LIstView will work and when no can you help me display it please?