when i wanted to load in 0.16.16 an older map that i saved with 0.16.x, i got this:
Error while applying migration: Extra Large Chests: XL_Chests_1.0.0.lua
XL_Chests/migrations/XL_Chests_1.0.0.lua:4: 'then' expected near 'force'

and also your homepage doesn't work: https://nah.net doesn't exist
it would be nice to use an existing private homepage, or maybe a post about this mod in the factorio forums (where people can discus, get notifications, and even add screenshots)

same error here.

when i wanted to load in 0.16.16 an older map that i saved with 0.16.x, i got this:
Error while applying migration: Extra Large Chests: XL_Chests_1.0.0.lua
XL_Chests/migrations/XL_Chests_1.0.0.lua:4: 'then' expected near 'force'

In the migration folder, add a "then" into the file XL_Chests_1.0.0.lua on line 3 -- that fixes the issue.

I don't have a personal homepage but I remembered that I had to write something into the homepage field.

That's right, I forgot to pair the 'if' with a 'then'.