Shield items can't be colored

I get this error when i try to color a shield in the latest versions

"[16:06:55 WARN]: [MythicMobs] --| Error Message: The shield color is configured incorrectly, must use a color from the Bukkit DyeColor ENUM."

But i'm using the correct color, also it's correctly working on older dev builds

This is an item i used to test, it's a super simple shield with just a color option and it will still give the error: https://paste.md-5.net/ifigibiwun.apache