SQLite update row error no such such column

SQLite database constantly giving no such table error

here's my code

    public void addRating(String name, String ndate, String nrating,
    String ncomment)
{

SQLiteDatabase data = this.getWritableDatabase();

Cursor query = data.rawQuery("update Station Set " + " date = "
        + ndate + "," + " rating = " + nrating + "," + " comments = "
        + ncomment + " where Stationname = '" + name + "'"  , null);
query.close();

}