Crashreport:
https://pastebin.com/DgRJ9xrN

fp2 is not ready for significant play, the pre-pre-pre-pre-pre-alpha warning should have said as much.

Regardless this is likely an incompatibility with one of the non-required mods you have
try removing them one by one until you find the one responsible

Ok i'll try

It crashes with the same crash report.
I think it's something with forgerocks

The crash itself is some weird filesystem error that doesn't make a lot of sense to me
But you should not be using fp2 in a modpack and expecting anything to work

Just wanted to try it out because im playing on a potato

fp2 is not a performance mod

fp2 is intended to work alongside vanilla rendering, not replace it, and it is not a performance mod, despite what the idiotic youtubers may try to tell you in a desperate bid to get views. the idea is not to make the game run faster, the idea is that you're taking a 50% performance hit in order to extend your render distance by multiple thousand times.

Is there a possible work-around?

edit: I am having a similar issue: no extra mods, just listed requirements. Same error message.

if you're running x86 java, see DaMatrix/ForgeRocks#3 (comment)

Having the same issue here

Edit: Solved, seems to be the mod ForgeRocks is incompatible with Java x86

this is an issue with ForgeRocks, not fp2.