Please note that "error code 1" only means "it crashed", with error code 0 meaning "game closed without crashing".
To help diagnose your issue we need your debug.log in full, found in %AppData%\.minecraft\logs\ . Please put it on pastebin.com and provide a link
These can be safely ignored, it's not an error.
From top to bottom, this is saying "found the mod loader", "found the java mod support", "found the lowcode mod support (think global datapacks)", "found the game".
JarJar is the name for Forge's jar-in-jar system. Basically, mods can embed dependencies and libraries inside their mod jar. These log messages are saying it already found the required deps as normal jars and will be using those instead of embedded ones, nothing to worry about.
This isn't part of Forge. We need your debug.log to be able to assist you further.