MY Xbox LOCKED WHEN I Use Save But It Gave Error
Welcome to the community.
I’m not an Xbox player nor a Horizon user, but as far as I understand, this is not a Horizon issue. It is likely an issue with the storage device you are using.
You’d have found this information by using the search button in the top-right of the forum.
Try a different flash drive, as it suggests in this post: Need help I got this error Message on Horizon - #2 by XxExoticWandererxX.
Or reformat the flash drive, as this post instructs: Horizon - Possible Solution to "error has occurred whilst writing back to the loaded package!".
Horizon hasn’t been changed in any way for years and it is no longer actively developed, as Xbox 360 just isn’t that popular anymore. So there’s little reason for Horizon to break all of the sudden.