well exactly as it says the map ur porting to is corrupt
I believe this is from the client AND server-side map data files being out of sync. You need to make sure both files fully match.
You need to make sure the data in both files match. This is done using Structorian to edit your files via structures. Check the tutorial section for more info, I think someone has a guide posted regarding map info.
Either way, this doesn't happen in unmodified files. If you can't figure it out, I'd recommend setting up a fresh set of server files or finding a better client.