Latobius

You need to update your java version. Try adoptium: https://adoptium.net/temurin/releases/?os=any&arch=any&version=21 Scroll down to windows if that's what you're using. You'll probably want to choose the .msi file. Technically all you should need is the JRE, but when I tried to select it from the dropdown it wasn't working and the JDK works fine too. After you download the .msi file and start the installation wizard, make sure you select the options to add installation to path, set java home variable, and associate jar files with java. Once you've done that, you should be able to run your .sh or .bat script and it should work fine.

Darn. Well, thanks for trying, and for the quick replies too.

Here's the new log. New server log (github.com)

Right. I already ran it a few times without my friend since then because I was trying to figure things out. Is that alright, or should I get you new logs with my friend trying to join? Server log (github.com)

The server is hosted on my PC and I can connect to it with same PC, but my friend cannot. I looked through his log and at line 9282 there is [Render thread/WARN] [net.minecraft.client.network.play.ClientPlayNetHandler/]: Incomplete server tags, disconnecting. Missing: {minecraft:item=[minecraft:emerald]} Any help with this would be much appreciated. I made a server, I can connect to it just fine but my friend can't. Seems like there's something weird at line 9282 (github.com)