Buildcraft version: 7.99.12
Forge version: 14.23.1.2555
Minecraft version: 1.12.2

Link to crashreport or log (on pastebin or gist, please don't put the entire log here) :
https://pastebin.com/dbMftfcp

Singleplayer/multiplayer: Single Player

Additional information:
I am using the 7 different independent packages.
And no, I am NOT using the Compat version - Yet.... as its not released for 1.12.2

looks like an issue in sensorcraft, somehow it's rendering is getting associated with the oil block and when building the models that goes wrong

This might be related to #3882.

@SirTwsted can you retry with 7.99.13-pre9?

@AlexIIL ok, have to give me a bit of time tho.
but ill try the Pre versions and let you know if I break anything.

@AlexIIL - I broke It again....
Caught exception from BuildCraft Transport
Caused by: java.lang.NumberFormatException: For input string: ""
.
https://pastebin.com/tBWUmbHT
.
MC v1.12.2
Tested with (buildcraft 7.99.13-pre9) "7 separate packages"
Using Forge v14.23.1.2555

Additional Notes:
When I use (buildcraft-lib-7.99.13-pre9) and (buildcraft-core-7.99.13-pre9)
I got this -->> https://imgur.com/a/VGv7w
I thought these go together, I guess not :( hehehe....
Anyways, I disabled the (buildcraft-lib-7.99.13-pre9) and just used (buildcraft-core-7.99.13-pre9)
with the additional packages and I got the crash posted above.

Ah. Unfortunately it looks like you're encountering some WIP stuff related to #3877. (Which can be temp-fixed by removing codechickencore or (updating it from their maven?))

Core includes lib (as there's no reason not to), which just means that you don't have to download lib if you need core.

ok, let me know if you need another guinea pig test :P
BTW - I dont have codechickencore installed. I have the LIB version as its needed for 2 mods I have installed
and without it, minecraft starts to scream....LOL

@SirTwsted do you still have this issue? the crashes should be fixed from codechickenlibs end if you update it

Should have been fixed in the same way as #3882 as we no longer go through forge when registering block models.