main missiongroup json files say null

so I've been working on a map for three months now, its been renamed and all so it doesn't conflict with other mods. did nothing but add roads last night and saved it. when i went to start it back up the next day the main missiongroup json files all say null. any ideas on how i would fix this without having to start over.

 

Oh no
If you don't have a backup it is the end of the story. I had this problem a while ago, too. Since then I do not touch the World Editor without backup or even git.
I feel with you...

 

thanks for the resonse

 

You can delete only all the null files. So you can access the terrain then and the non null files, if they are ok.