ChatColor Plugin GUI Error with PaperMC 1.21.1

[v4r1n]

Describe the bug
When attempting to use the /chatcolor gui command, an unhandled exception error is triggered. This results in the GUI failing to open, rendering the command unusable for users.

Expected Behavior
The /chatcolor gui command should open the ChatColor GUI for users without any errors, allowing them to select their preferred chat colors.

Actual Behavior
An unhandled exception error occurs upon executing the command, causing the GUI to fail to open. The error trace points to issues in the ProfilesCore class and ProfileContainer methods related to skull metadata.

Steps to Reproduce

1. Start the Minecraft server running PaperMC 1.21.1.
2. Execute the /chatcolor gui command in the chat.
3. Observe the error in the console/log as the GUI fails to open.

Plugin List
Plugins on PaperMC backend server: ChatColor v2.7.10

Software brand
PaperMC 1.21.1-130-ver/1.21.1@4d2672e with Velocity as a proxy server

Additional Information
The error log indicates that the issue is due to a missing or incompatible field within the ProfilesCore class, potentially caused by recent changes in PaperMC's handling of profiles. This issue may require compatibility updates for the ChatColor plugin to work with the current PaperMC version.