Hello,

 

I've recently made an attempt to start a server, and with this in a batch file:

 

java -Xmx4G -Xms1G -d64 -jar forge-1.11.2-13.20.0.2309-universal.jar
PAUSE

 

It runs successfully, however I get an error and it halts:

 

java.lang.RuntimeException: FML was unable to install the security manager. The game will not start

 

On Line 211. fml-server-latest.log: https://pastebin.com/WGjJB2TC

 

Any ideas on how to fix this? Also, running on a windows box; 10 with java 8 x86-64 installed

This led me in the right direction, thank you.

 

Turns out there was another forge jar in my mods folder, for future reference.