Why did this happen? (World turns black)

Okay so I was testing(Running Minecraft on Mcreator) out my mod and it was okay and worked fine but after a texture change and testing everything was black execpt the sky and the hotbar, even vanilla blocks were are black and items were a black square. It wasn't pink&black like a texture error but just soild black.

I changed the texture back again to the one before the "blackout" but still the world was the same, black.

I only have one mod element, a fluid that's it. Do you know why it is happening?