Not sure if it's something that can be fixed, as Krastorio 2 and Amator Phasma's Coal & Steam both seem to heavily edit the base game in similar ways, but I get this error when I try to use them together: https://i.imgur.com/C3YXOcE.png

This error originates from bugged code in K2
I recommend filing a report with Krastor

It's usually easy to make two large mods not cause errors with each other
The difficult part is making them balanced with each other

Unfortunately, I remember reading on their page that they aren't dedicating any updates to be compatible with other mods, due to how large and complex their coding structure already is, but I'll give them a poke and see what happens.