@Andrewdodo123 Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first (as you agreed when registering on the forum).

Please use a descriptive title - rather than "Help needed". Also do not bump posts - wait patiently for a reply.

Perhaps you have a bad Sdcard or you have written the image incorrectly.