Mixin: Reference map could not be read.

[AiLovesAi]

A warning shows in the server log saying a Mixin reference map could not be read. This issue causes no problems with the mod from what I have seen.

Expected Behavior:

No error.

Steps to Reproduce:

This should occur whenever running a server with Structure Toolkit installed.

Versions:

Minecraft: 1.16.5
Forge: 36.2.2
Structure Toolkit: 1.16.5-1.0.2

Log:

[17Aug2021 17:13:12.936] [main/WARN] [mixin/]: Reference map 'structure_toolkit.refmap.json' for structure_toolkit.mixins.json could not be read. If this is a development environment you can ignore this message

[Patrigan]

Not proper cleaning after removing a mixin I thought I needed. Should indeed not impact. Might need a mixin for a new change I'm planning, so will probably not fix immediately. I hope that is fine.