Fluid Texture wont show up (Forge 1.12.2 14.23.2.2619)

Hello,

Im currently trying to setup a fluid. It works fine just now, the only thing is that no custom tex will be loaded

Here is my fluid class:

import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fluids.Fluid;
import net.minecraftforge.fluids.FluidRegistry;

public class FluidDung extends Fluid {
    public FluidDung() {
        super("dung", new ResourceLocation("renergy:blocks/fluid/dung_still"), new ResourceLocation("renergy:blocks/fluid/dung_flow"));
        setColor(new java.awt.Color(128, 64, 0));
        setDensity(1100);
        setGaseous(false);
        setLuminosity(0);
        setViscosity(25000);
        setTemperature(300);

        FluidRegistry.registerFluid(this);
    }
}

And this is the class were I register the fluid:

public class RFluids {
    public static FluidDung DUNG;

    public static void registerFluids()
    {
        DUNG = new FluidDung();
    }

}

"RegsiterFluids()" will be called in common FMLProxy:

@Proxied
public class FMLProxy {

    public void onPreInit(FMLPreInitializationEvent event) {
        RFluids.registerFluids();

    }
...
}

the textures are located in:

resources\assets\renergy\textures\blocks\fluid\dung_still.png

resources\assets\renergy\textures\blocks\fluid\dung_flow.png

as well as the MCMeta files.

the fluid works as intended, only without texture (the MissingTexture-Texture will be displayed)

I tried to figure it out for at least two hours now and can't get it working...

Coding on Intellij IDEA Community Edition 2017.3.4

Any suggestions?

cad435