So I got my server working just fine with forge 1.16.5 me and my friend played on it for a few minutes, then I installed 2 mods that i just randomly found (DarkUtilities and Mekanism) and the server would start then stop again. pls help 
What do the logs show as the reason it stopped?
yeah I figured it out
ether the mod wasn’t compatable or it needed some other mod thing to be installed