Does it prevent the game from loading, or does the migration just fail, then let you continue as normal?
I'm trying to load the last file-save and then get this error, but factorio is not collapsing.
If I try to start a new game then the game start successfully, but the problem is the technology ...

I had installed Yuokimodpack. Now after installing Bob's getting this error:
Error while applying migration: Bob's Warfare: bobwarfare_0.12.10.lua
Cannot execute command. Error: [string "game.reload_script()[]..."]:7:attempt to index field 'tanks-3' (a nil value)

bobwarfare_0.12.10.lua CODE ...