Unsolved Missing main.level.json in GridMap folder (Partly Solved)

I'm missing the main.level.json in the GridMap folder, all other map folders have the main.level.json, but GridMap doesn't have it. Without it I am unable to create my own map. If you know anything about this please help. Thank you!

 

Did you try verifying the integrity of the game using Steam?

 

I just did that, It got verified, but the folder is still missing.

 

Hmm, you are correct, I also have non. (I always use an older version of gridmap)
I use this file (see attachments), it does the same as main.level.json (I think), but it's older AND STILL WORKS.
Edit: I think this file is the main.level, main.forestbrush and main.decals but in 1. Please, someone who knows more about this file system, if this is wrong, correct me.

 

Thanks, I'm gonna try that, its a good alternative, but it doesn't fix the problem itself (the problem of this game version)

 

No problem. I think it is some sort of bug, or it is intential, I don't know. It is weird, for sure..

 

Yeah it is wiered, cause it always was there, and all other maps have it, just this one doesn't...