any ways here is just a simple nil value error
i can look into seeing about fixing it myself but right now i want to simply play and am slightly tired right now so if you cant find a fix i can see if i can

Are there any other mods installed or just this one?

oh,... I have at least ~50-100 I think or close to that and sorry if I did not catch your reply as soon as possible as I was not browsing the page all that often but I am currently in a state of wanting to sleep right now but can't as I don't feel it physically and I will see about writing a list as soon as possible

oh and correction on the 50-100 it is closer to 150 ish (well the 5-Dim has several folders)

I am taking a closer look and it is in data-updates line 48 and btw with the number of mods I have installed, it takes about ~3-5 minutes to load without any mod errors

I think that if there is a subcategory already made that has fluid as its name then line 48 can be skipped as it is to create the subcategory right?

and sorry for all the notify messages that you may receive but I am writing as I am thinking and sorry for the difficulty but I think I have the mod that makes barrels of fluid without using any empty barrels if this mod is not the problem then i don't know what it is off the top of my head as some the mods in my mod list are disabled so what exact ones that are causing trouble I have no clue

oh and I used visual studio code as it has loads of supported code languages and ability to have multiple files open like browser pages so then I can quickly flip back and forth that and I can click with scroll wheel and it shows matching words is great for looking for where function names are used just fyi about how I am looking at your code

So I did not test compatibility with any other mods. Almost everything in this mod is done automatically (recipe conversion, groups adding, etc.) there can, and certainly will, be issues and collisions with other mods. You can create a pull request with fixes for compatibility on github page if you have some.