Please help us help you better by showing us the code you have and the exact error messages you get. This enables us to much better pinpoint where you are having problems.

Please note that this is not a code writing service. While we will try to help you understand what happens and try to teach you approaches to a solution, we expect you to program the solution yourself.

Asking for "short examples" makes me feel like you expect us to do your paid work for free. This is not how this site works.