You don't post all the code so it is difficult to say what the problem is.
The error is caused by some issue with your overlay texture.
I would guess this relates to how Mojang changed it so that block textures are only loaded from the "block" subdirectory by default.
See the section on resource packs here:
Yours is in "fluid" which won't get loaded into the block atlas.
This is a custom fluid I made using Kaupenjoe's tutorial and I can't figure out why this is now happening for the life of me. Here is the crash log. Here are the ModFluids class, ModFluidTypes class, and BaseFluidType class just in case. I any other classes are needed just let me know, please.
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