The Failure looks like a permission issue but the permissions look all right to me:
ls: cannot access 'forge-*.jar': No such file or directory
+ FORGE_JAR=
+ java -server -XX:+UseG1GC -XX:+UnlockExperimentalVMOptions -Dfml.queryResult=confirm -Xms4096m -Xmx4096m -jar nogui
Error: Unable to access jarfile nogui
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drwxrwxrwx 1 nobody users 219 Sep 12 08:39 vaulthunters/
intrestingly enoght skyfactory 4 works vaulthunter doesn't