I get an error message when I try to run this mod after adding it.

Failed to load mods: kry-custom-grids/prototypes/mod-compatibility.lua:166: attempt to call global 'modifyEquipmentCategories' (a nil value)
stack traceback:
kry-custom-grids/prototypes/mod-compatibility.lua:166: in main chunk
[C]: in function 'require'
kry-custom-grids/data-updates.lua:9: in main chunk

it looks like a compatibility issue, after running through all my mods, I found it to not run when I have a series of mods, (or any of them) from Schall, for example:
https://mods.factorio.com/mod/SchallArmouredTrain
https://mods.factorio.com/mod/SchallTankPlatoon

Thanks for the catch, I forgot to test with those mods because they were broken without that one compatibility patch mod. The base vehicle equipment grid mod had a few functions removed that this mod relied on, forgot to replace it in these particular instances.

Fixed in v1.1.7