I recently started to attempt to make a basic sword in Blockland. I ended up downloading blender and putting everything together and I've been trying to troubleshoot why my item hasn't been working for the last few hours. The issue is that whenever I select the item ingame it appears to be invisible (The model is invisible not the icon). I am assuming it is probably a texture error and I would someone to please explain how to fix this issue. I tried to follow a couple of tutorials but I feel like I messed up the textures of my sword.
Here is a link to my blender file
https://www.mediafire.com/?z6k0656gtft6cboHere is an image of my folder of the weapon

Thanks!
EDIT (FIXED) : Make sure to toggle Legacy mesh format when saving!!!