DaemonUmbra

Did you read what I asked you to read or did you just see it as a request for logs and stop reading there?

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Provide debug.log without Optifine

Try removing Optifine

What do you mean by "blip" and is there a text file next to the installer?

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Not at all similar, don't post in unrelated threads. 1.8.9 is no longer supported, please update to receive support. This thread in ancient, don't necro.

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Delete C:\Users\solit\AppData\Roaming\.minecraft\config\fml.toml and try again

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Try running a dedicated server locally instead

Issue between MacOS and GLFW, it's been fixed on the GLFW end but it doesn't look like Mojang is going to retroactively upgrade old versions to use the new GLFW/LWJGL

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Try installing to somewhere that OneDrive never had access to, it doesn't need to still be on the PC for its access rules to screw things up

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.11 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

User was banned for piracy. Buy the game.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

I don't even see the crash in the debug.log you provided, your friend being a pirate isn't causing this issue but it's making me not want to help you if you're supporting piracy.

Well if your friend hasn't bought the game, told you to set it to offline mode, and has been on the server then he or she is a dirty pirate

No, I'm asking if you have both bought the game

Do you own the game? Does your friend?

Why is your server in offline mode?