SQLite Exception - no such column

package com.example.meineApp;

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

public class MySQLiteHelper extends SQLiteOpenHelper {

	private static final String DATABASE_NAME = "userSession.db";
	private static final int DATABASE_VERSION = 1;
	
	private static final String TABLE_CREATE_SESSION = ""
			+"CREATE TABLE session("
			+"id INTEGER PRIMARY KEY AUTOINCREMENT, "
			+"name TEXT,"
			+"passwort TEXT,"
			+"start DATETIME)";
	
	public MySQLiteHelper(Context context){
		super(context, DATABASE_NAME, null, DATABASE_VERSION);
	}
	
	@Override
	public void onCreate(SQLiteDatabase database){
		database.execSQL(TABLE_CREATE_SESSION);
	}
	
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
		Log.w(MySQLiteHelper.class.getName(), 
				"Upgrading Database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data");
		db.execSQL("DROP TABLE IF EXISTS SCANITEM");
		onCreate(db);
	}

}

SQLite does not have a storage class set aside for storing dates and/or times. 
Instead, the built-in Date And Time Functions of SQLite are capable of
storing dates and times as TEXT, REAL, or INTEGER values:
TEXT as ISO8601 strings ("YYYY-MM-DD HH:MM:SS.SSS"). 
REAL as Julian day numbers, the number of days since noon in Greenwich
       on November 24, 4714 B.C. according to the proleptic Gregorian
       calendar. 
INTEGER as Unix Time, the number of seconds since 1970-01-01 00:00:00
       UTC.  

Applications can chose to store dates and times in any of these formats and
freely convert between formats using the built-in date and time functions.

private String[] allColumns = {"id", "name", "passwort", "start"};
protected boolean sessionExists(){
	Cursor cursor = database.query("session", allColumns, null, null, null, null, null);
	cursor.moveToFirst();
		
	if(cursor.getCount() == 0){
		return false;
	}
		
	cursor.close();
		
	return true;
}