Error when changing id

I changed the id of the map section from the standard one to "skys_wtrn1" now you can't go to this section - there is a void there, and when moving through the map in editor, the error "Error in Dialogs\WorldMap.cpp in line 84." and crashes.
Is the expansion file killed?

Unfortunately yes. I now keep at least 2 separate expansion saves that are not the same for this reason. I’m really sorry this happened to you.