Missing texture on texture pack

so i am trying to make it so that a diamond sword changes textures once it is renamed to a certain name



here is my texture

https://drive.google.com/file/d/1axpHu0ktAuu1oFLFuvYW2f_rXLhyH9b5/view?usp=sharing



and for my .properties folder this is it turned into text form
type=item
items=minecraft:diamond_sword
texture=./Hades_blade.png
nbt.display.Name=ipattern:*hades blade*


when i load this in 1.16.5 (optifine) it just gives me the texture not found purple checker texture