Code(1) not found a column during compilation

package com.example.hello.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class sqlitedatahelper extends SQLiteOpenHelper {
     private static final String LOGTAG = "SMILE";
     private static final int DATABASE_VERSION = 1;

        // Database Name
         static final String DATABASE_NAME = "storesxis.db";

        // Contacts table name
         static final String TABLE_storesxis = "storesxis";


        static final String COLUMN_ID="id";
        static final String COLUMN_startx="startx";
       static final String COLUMN_starty="starty";
      static final String COLUMN_stopx="stopx";
         static final String COLUMN_stopy="stopy";
      //  private static final String COLUMN_Timetaken = "totaltime";




    static final String CREATE_TABLE = "CREATE TABLE " + TABLE_storesxis + "("
            + COLUMN_ID  + " INTEGER PRIMARY KEY AUTOINCREMENT ," + COLUMN_startx + " TEXT,"
            +  COLUMN_starty + " TEXT,"
            + COLUMN_stopx + " TEXT," + COLUMN_stopy +  " TEXT" + ")";



    public sqlitedatahelper(Context context) {

        super(context, DATABASE_NAME , null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
         db.execSQL(CREATE_TABLE);
         Log.i(LOGTAG, "hello table is created");
        // TODO Auto-generated method stub

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
        db.execSQL("DROP TABLE IF EXISTS" + TABLE_storesxis );
        onCreate(db);
        // TODO Auto-generated method stub

    }

}

Datasource.java

package com.example.hello.db;




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

    //import com.example.h.MainActivity;

    import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

import com.example.hello.Funtionstore;


    public class Datasource {
         private static final String LOGTAG = "SMILE";

        SQLiteOpenHelper dbhelper;
         SQLiteDatabase database;
         private static final String[] allcolumns ={
             sqlitedatahelper.COLUMN_ID,
             sqlitedatahelper.COLUMN_startx,
             sqlitedatahelper.COLUMN_starty,
             sqlitedatahelper.COLUMN_stopx,
             sqlitedatahelper.COLUMN_stopy};
        public Datasource(Context context){
             dbhelper = new  sqlitedatahelper(context);
             }

        public void open() 
        {
            Log.i(LOGTAG, "hello open");
             database = dbhelper.getWritableDatabase();
        }
        public void close() 
        {
            Log.i(LOGTAG,"HELKLO");
            dbhelper.close();

        }


    public Funtionstore create(Funtionstore storep)
    {
        //SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(sqlitedatahelper.COLUMN_ID, storep.getID());
        values.put(sqlitedatahelper.COLUMN_startx, storep.getStartx());
        values.put(sqlitedatahelper.COLUMN_starty, storep.getStartx());
        values.put(sqlitedatahelper.COLUMN_stopx, storep.getStopx());
        values.put(sqlitedatahelper.COLUMN_stopy, storep.getStopy());
        long insertid = database.insert( sqlitedatahelper.TABLE_storesxis, null, values);
        storep.setID(insertid);
        return storep;

    }
    public List<Funtionstore> findAll(){
        List<Funtionstore> storeps = new ArrayList<Funtionstore>();
        Cursor cursor = database.query(sqlitedatahelper.TABLE_storesxis, allcolumns,
                null, null, null, null, null);
                Log.i(LOGTAG, "returned" + cursor.getCount() + "row");
        if (cursor.getCount()>0) {
            while (cursor.moveToNext()) {
                Funtionstore storep = new Funtionstore();
                storep.setID(cursor.getLong(cursor.getColumnIndex(sqlitedatahelper.COLUMN_ID)));
                storep.setStartx(cursor.getFloat(cursor.getColumnIndex(sqlitedatahelper.COLUMN_startx)));
                storep.setStarty(cursor.getFloat(cursor.getColumnIndex(sqlitedatahelper.COLUMN_starty)));
                storep.setStopx(cursor.getFloat(cursor.getColumnIndex(sqlitedatahelper.COLUMN_stopx)));
                storep.setStopy(cursor.getFloat(cursor.getColumnIndex(sqlitedatahelper.COLUMN_stopy)));
                //storep.add(storep);
            }

        }
        return storeps;
    }
    }

I have a problem with code on executing project system doesnt found column stopx this is the helper class dnt know whats really wrong with it .........Initially when i create table witth no values table was sucessfully created but when i try to pass values it causes problem ..... This is my full code consist of 4 classes i try to store axis at starting n ending points of writing on canvas but now at initial stage i am working with static data but have problems try to follow tutorials inorder to store data but have this issue... Any one if kindly check this code n let me know about the problem and solution i shall be very thankfull to him ....