I have been trying to play an older modpack (Stoneblock 1) but the whenever I try to play the game it instantly crashes with exit code 1. I have tried adding more ram and changing my jdk version to the one that I used to play the pack originally (~2 years ago) as well as repairing and reinstalling the pack in forge. This error is occurring for all versions of forge 14.23.5 available in the launcher.
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Solved: I downloaded the java 8 1.8 jdk and ran using that whereas I had been using 15 and 16. it appears that my 1.8 instance had removed itself at some point or another.