DaemonUmbra

Oh, Windows is hiding the file extensions, it's showing as just "debug" for you but it's actually called debug.log

I'm a bit confused about how you think this works. It sounds like you're under the impression that build/libs is a place where you put things in. Is this correct?

The logs I need are described in my signature

The launcher_log.txt would not be in the logs folder, it would be in the .minecraft folder

Not exactly but it should be the same text.

Do you have a launcher_log.txt ?

Ah yeah they don't show on mobile. I need logs from the game, is there anything stopping you from revisiting this page on your PC?

How did you install Forge? What launcher are you using? (Please provide a screenshot)

Are you on mobile or do you have signatures turned off?

It is:

That is not debug.log

Please read the "Logs" section of my signature below and provide the appropriate log in the appropriate manner.

This information is in my signature.

You have not provided game logs or launcher logs, I need more information that those files provide.

So you are saying you've made a Minecraft mod without knowing how to install it on your client?

Please don't make duplicate threads, especially when I'm already trying to help you in this thread.

Try without Optifine

Ok, then run the forge jar from the command line and tell me what it says.

Please don't make duplicate threads (threads merged) That's the log from your Curse or Twitch launcher, please provide the Forge log. (More info in the "logs" section of my signature below).

You need to do your research. You need to make sure that each mod has a version made for your desired version of Minecraft, and make sure you get that version of the mod. What this particular error is indicative of at this point in time is you are likely trying to run 1.12.2 mods on 1.13.2

Where are you getting Optifine from?

Thread Moved

1.8.9 is no longer supported on this forum due to its age. Please update to a modern version of Minecraft to receive support.

Is there anything in the logs folder? If so, follow the instructions in my signature, if not then say so.

Mods are not compatible across Minecraft Versions. Also please be careful where you get your mods from (please read my signature for more info).