Aikars flag doesn't work

Hi so I just bought new server for minecraft I’ve installed Pterodactyl panel and I’ve also tried to use aikars flag.
https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/
Server is 1.16.4 paper #416 build.
Short while after I start the server it’s crashing with “exit code 1”.
I did same thing on my pc and console output is “Could not find or load main class .aikars.flags=mcflags.emc.gs”

You most likely copied the flags wrong then. How are you starting your server? Please paste the command

java -Xms4G -Xmx4G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -jar paper.jar nogui

Read the section right below the flags for Pterodactyl users

I’ve deleted those flags “-Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true” and server is running properly. What are thoes flags? Is it important?