ForgeMod has changed its log output format, and as such MCMA2 no longer recognises it.
Thankfully there's a simple way to change Forge back to its original settings.
Create a file called Log4j.xml and place it alongside your copy of ForgeMod.jar, and insert the following contents:
<?xml version="1.0" encoding="UTF-8"?>
<configuration status="warn" packages="net.minecraftforge.server.terminalconsole.util">
<appenders>
<console name="SysOut" target="SYSTEM_OUT">
<patternlayout>
<loggernamepatternselector defaultpattern="[%d{HH:mm:ss}] [%t/%level] [%logger]: %msg%n">
<!-- don't include the full logger name for Mojang's logs since they use full class names and it's very verbose -->
<patternmatch key="net.minecraft." pattern="[%d{HH:mm:ss}] [%t/%level] : %msg%n"></patternmatch>
<patternmatch key="com.mojang." pattern="[%d{HH:mm:ss}] [%t/%level] : %msg%n"></patternmatch>
</loggernamepatternselector>
</patternlayout>
</console>
<queue name="ServerGuiConsole" ignoreexceptions="true">
<patternlayout>
<loggernamepatternselector defaultpattern="[%d{HH:mm:ss}] [%t/%level] [%logger]: %msg%n">
<!-- don't include the full logger name for Mojang's logs since they use full class names and it's very verbose -->
<patternmatch key="net.minecraft." pattern="[%d{HH:mm:ss}] [%t/%level] [minecraft/%logger{1}]: %msg%n"></patternmatch>
<patternmatch key="com.mojang." pattern="[%d{HH:mm:ss}] [%t/%level] [mojang/%logger{1}]: %msg%n"></patternmatch>
</loggernamepatternselector>
</patternlayout>
</queue>
<rollingrandomaccessfile name="File" filename="logs/latest.log" filepattern="logs/%d{yyyy-MM-dd}-%i.log.gz">
<patternlayout pattern="[%d{HH:mm:ss}] [%t/%level] [%logger]: %msg%n"></patternlayout>
<policies>
<timebasedtriggeringpolicy></timebasedtriggeringpolicy>
<onstartuptriggeringpolicy></onstartuptriggeringpolicy>
</policies>
</rollingrandomaccessfile>
<rollingrandomaccessfile name="DebugFile" filename="logs/debug.log" filepattern="logs/debug-%i.log.gz">
<patternlayout pattern="[%d{HH:mm:ss}] [%t/%level] [%logger]: %msg%n"></patternlayout>
<policies>
<onstartuptriggeringpolicy></onstartuptriggeringpolicy>
<sizebasedtriggeringpolicy size="200MB"></sizebasedtriggeringpolicy>
</policies>
<defaultrolloverstrategy max="5" fileindex="min"></defaultrolloverstrategy>
</rollingrandomaccessfile>
</appenders>
<loggers>
<!-- make sure mojang's logging is set to 'info' so that their LOGGER.isDebugEnabled() behavior isn't active -->
<logger level="${sys:forge.logging.mojang.level:-info}" name="com.mojang"></logger>
<logger level="${sys:forge.logging.mojang.level:-info}" name="net.minecraft"></logger>
<root level="all">
<filters>
<markerfilter marker="NETWORK_PACKETS" onmatch="DENY" onmismatch="NEUTRAL"></markerfilter>
</filters>
<appenderref ref="SysOut" level="${sys:forge.logging.console.level:-info}"></appenderref>
<appenderref ref="ServerGuiConsole" level="${sys:forge.logging.console.level:-info}"></appenderref>
<appenderref ref="File" level="${sys:forge.logging.file.level:-info}"></appenderref>
<appenderref ref="DebugFile" level="${sys:forge.logging.debugFile.level:-trace}"></appenderref>
</root>
</loggers>
</configuration>
You can find a copy of this configuration here: https://pastebin.com/raw/jJZ8dYFA
Then in McMyAdmin.conf
, add the following to Java.CustomOpts
-Dlog4j.configurationFile=log4j.xml
This will revert Forge to its original log format and allow it to function correctly.