Can't load/create Single Player worlds after upgrading from 1.0.2 to 1.0.7

[GrokDuckFarmer]

I am unable to create any new Single Player worlds or load any of the Single Player worlds I created in 1.0.0 and 1.0.2 after upgrading my instance to 1.0.7. It complains that there is a datapack incompatibility. I'm offered a chance to go in "Safe Mode" without the datapacks, but that doesn't work.

Error message text:
"Errors in currently selected datapacks prevented the world from loading. You can either try to load it with only the vanilla data pack ("safe mode"), or go back to the title screen and fix it manually."

Looking at the /datapack folder under my saves shows no datapacks.

Steps are super simple:

1. Install version 1.0.2 of Benchmark II
2. Create a Single Player world
3. Upgrade to version 1.0.7
4. Join the created Single Player world -- see datapack error message
5. Try creating a new Single Player world -- see datapack error message

[Chuunkyz]

don't "upgrade" modpacks, remove them and reinstall it
otherwise configs and customization will be broken, i assume you're using cf launcher, if so yea don't "update", it's not safe, not just for this modpack

[Chuunkyz]

also, datapack error doesnt mean there's a datapack installed, every mod has a data folder and there's custom datapacks for the modpack too...