❗ Checklist

• I am using the official english version of Slimefun and did not modify the jar.
• I am using an up to date "DEV" (not "RC") version of Slimefun.
• I am aware that issues related to Slimefun addons need to be reported on their bug trackers and not here.
• I searched for similar open issues and could not find an existing bug report on this.

📍 Description

By opening the GUI, it appears ¨error: Missing String "nameofaddon"

This only appears with addons only
Addons work without problems

📑 Reproduction Steps

Install any addon

Update Slimefun to DEV - 919

Open the book / GUI

💡 Expected Behavior

Normal display of the names

📷 Screenshots / Videos

https://imgur.com/a/vTxi9az

📜 Server Log

N/A

📂 /error-reports/ folder

N/A

💻 Server Software

Paper

🎮 Minecraft Version

1.16.x

⭐ Slimefun version

DEV 919

🧭 Other plugins

No response