Ok now working, you must delete ftb app, delete files from install folder and files from roaming, it's a "ftb-app" next you must install again launcher and install modpack and move old files to new modpack folder
Now I can install again modpack, copy files from folder with old modpack to new file with modpack and this work but to exit game, next time will again error and modpack "will be removed"
I updated today launcher to new version and now (my installed a few weeks ago modpack Omnia) i can't play on this modpack because i have to download modpack again and all settings was reset to default, but i have file with modpack on disk. What i can do ?