First of all, I had noticed myself that when I was trying to make a new game my FM also crashed. That is happening due to the many changes in the files I had included in the last pack. So i have searched and find some solutions :
1. I had only my files in the editor data folder, and for that all of them were ticked and i didn't need to press edit in the database selection screen, so I clicked ok and it took me directly to the nations selection screen. That worked for me perfect.
2. Someone in my facebook page wrote that as a possible solution , which worked for him : Quit the game. Go to "C:\Users\*your-user-name*\AppData\Local\Sports Interactive" and delete all folders. If you want you can try this, I am not responsible for anything.
This has nothing to do with my files. All of them are correctly edited with no faults at all. It's the game's problem, which probably "can't read" so many changes in the database. Last year I had over 100.000 changes and none ever made a crash on FM. This year we had this crash. I hope that everything is fixed with the new official patch.
I feel sorry for those who downloaded the files and didn't work for them. It's fairly bad because I wasted many hours to complete as many nations as possible and you couldn't see the results. I hope at least that we won't have same problems in future releases. I have to say again that has nothing to do with my files, but it's the game's error.