Everything worked fine before the update with all my current mods. This message appears now https://ibb.co/cOKkpx.

Yeah that was my bad. I had to change a lot of conditions for using mini, bobs, and angels that involved the refinery and chemical plants. My checks were a little off, but they should hopefully be fixed in v5.0.5

Unfortunately I'm still getting it with 5.0.5. 5.0.3 works fine still.

Alright, just for some more information, do you have the tech tree setting enabled (in 5.0.3), and are you running any of bobs or angels mods?

EDIT: You wouldn't happen to be using angels petrochem, but not bobs mods, would you?
EDIT2: Yup, that was the issue. I have no idea why you would be using angels refining and petrochem without bobs, but I got the error to pop for me like that. Guess I can't just assume petrochem users are bobs users.

Should be fixed in v5.0.6

Hmmm.... I don't use bobs modules so that could be it, have all the other bob mods though.

Either way 5.0.6. works, lol. Also this mod is great, makes things so much neater looking... Thank you very much. Very quick with the updates too.

How odd.. maybe a setting somewhere.. well at the very least, I'm glad it finally worked. And thanks, I'm glad you like it! I like having no errors in my mods :D