i am new to minecraft 1.8 modding and was following along with mrcrayfish's tutorial but my mod does not load the texture on an item called ref_copper. i think it may have to do with png colour settings or permissions. Anyway here is a screanshot of what i mean https://i.sstatic.net/aDTv5.png
It looks like you've named something 'item' that should be named 'items'. If you look in your screenshot on the left, it says textures.item, whereas the error is looking for the file in textures/items/.
In the video you're referencing here, you can see that it looks like textures.items for the narrator.