So I'm trying to combine two modpacks (crazycraft 3 and texit 2) and I'm getting the error "Caused by: java.lang.OutOfMemoryError: PermGen space" on the server side (and not on the client side). So after doing some digging online I learned that adding the java argument "-XX:PermSize=256m -XX:MaxPermSize=512m" would most likely fix the issue however, I can't figure out where to go to change the java arguments for the server, if that's even a thing that can be done server side. If anyone knows either where to add java arguments to the server or if there's another way to fix this problem that doesn't involve deleting a bunch of mods please let me know.
you can find the setting in your webinterface under "Settings" -> "General" and here at the "Java" section -> "-MaxPermSize". Simply set it to your desired value, click save changes and restart your server.
Thank you so much Alkyoneus, I finally got the server to launch.