Healers Log4J Proxy is conflicting with Forge Essentials LoggingHandler.

https://github.com/ForgeEssentials/ForgeEssentials/blob/1.12.2/develop/src/main/java/com/forgeessentials/util/output/LoggingHandler.java

This causes a class not found exception cause Forge Essentials uses the same codepath (https://github.com/Glease/Healer/blob/master/src/main/java/net/glease/healer/Healer.java#L99) to inject it's own appenders into the log4j config.

Attached is the crash report in question https://pastebin.com/ZyzjbYck
Removing the mod allows the server to start up however, it would be ideal for the mod to be compatible due to the criticality of the log4j issues!