multi parameter in ActiveAndroid

I am using ActiveAndroid as ORM system in my project and i use this line of code for Query over database

 List<Chats> s = new Select()
                .from(Chats.class)
                .where(col_conversation + " = ?  and " + col_sender + " = ? and " + col_body + " = ?",conversation.getId(),sender.getId(),body)    .execute();

but it fetch 0 row as result. i am sure that i have such row in database.