Can't get the panel to work

Hi! I have successfully launched this website a while ago: Now my client needs some adjustments and I made a duplicate on ONILIO - Verhuur en beheer van hotels with the necessary adjustments. Only, my images don’t work and my panel gives an error. How is this possible?

Thank you in advance!

Please remove the media folder from the copy. It will be recreated automatically. Check if it works then.

Also, make sure that you copied the invisible .htaccess.

Thank you! the .htacces file did the trick!