Ahhh. It's pulled direct from Factorio. Got it. I was confused!
Ok well I tried 2.1.7, 2.1.8, 2.1.9, and 2.1.10 they all worked OK with no mod errors. 2.1.11 was the one that threw the error. I'm currently using 2.1.10.
I'm using pY coal 1.8.7, pY coal graphics 1.08, pY industry 1.5.0, pY ores 2.1.10, pY ore graphics 1.07.
The latter two are to address the nexelit issue.
When I tried 2.1.11 I get the error:
item with name ht-pipes does not exist.
How can I send you my save? And thanks for helping out kingarthur.