Hello. So, I've been working on a skin pack that has a skin for the T-Series, as well as for the bigger sleeper the T-Series Expansion Pack has. I used the materials.json file from Top Tier Studio's Top Tier Transportation pack for the T-Series, because I didn't want to write a whole file from scratch. I didn't know what was causing the sleeper to have a no-material issue until I realized I forgot to change a part of the materials.json, so then I did. But then the whole skin just disappears, like if there wasn't any livery chosen. I don't know what to do from here, I triple-checked the materials file twice, and I couldn't find anything. If anyone knows what could be causing this issue, I'll be happy. Thanks! (Downloads of the mod file (both before fixing the typo in the materials file and after fixing that typo) are available if you need a closer look.) (Note: Yes, I am new to modding and this is my first skin mod.)