Using Latest.log

To locate your latest.log, this can be found in your .minecraft directory inside of the logs folder. Additionally, you can go into your launcher settings and tick the box that says "Open output log when Minecraft starts."

📁.minecraft
└── 📁logs
└── 📑log.latest

Don't panic, you may feel intimidated at first by the heaping mess of words in there, but all we need to find and care about is the actual error lines and once those are found they tell us exactly what the issue is!

Message: Unable to Resolve Texture Reference

[Worker-Main-38/WARN]: Unable to resolve texture reference: #missing in minecraft:custom/emerald_sword

If a model's texture doesn't load properly, you may find yourself with this error. This might look a little confusing but all it's saying is that it's unable to find a texture for the specified item and where it's missing from. If we want to resolve this error, we would need to make sure we have our custom sword texture in the "custom" directory under textures.

Message: Unable to load Model

[Worker-Main-38/WARN]: Unable to load model: 'minecraft:custom/emerald_sword.json' referenced from: minecraft:diamond_sword#inventory: {}
[Worker-Main-38/WARN]: java.io.FileNotFoundException: minecraft:models/custom/emerald_sword.json

If a model doesn't load at all, you may find yourself with this error. This is smilar to the error above, it's saying that it's unable to load the model in the specified directory and which item it was designated to. To resolve this error, we need to make sure that our emerald sword model is located in the specified directory (minecraft:custom/).

Incompatible/Out of Date Pack

If your resource pack is unable to be loaded, ensure your pack structure and all the required files are properly placed in your pack.

Capital Letters in File Names

Let's keep this short and sweet; capital letters don't work, don't use them, ever.

Invalid Unicode Characters

If your custom Unicode Textures are appearing as rectangles, they may be too large. Ensure your texture doesn't go over the maximum size, which is 256x256

Black and Purple Textures (1.19.3+)

This is due to an improperly configured, or missing, atlas file. Please check out the other guide on atlases.