Iris (I think) crashing MC with my modpack (DH) Exit Code -1

Hi, building a modpack on Curse Forge using MC 1.20.1 Fabric only, getting an exit code-1 crash when launching. I'm relatively new to modding and and only thing I can make out from the crash report is it's something to do with Iris. Any help would be much appreciated.

I used the Iris Universal Jar to install the DH beta, fabric, Iris, Indium...etc and moved those into my modpack instance. Made sure there's no duplicates as well
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