Yes, Recurrent Complex is crashing and that is already the most recent version for 1.7.10 Minecraft, and there hasn't been an update on that mod for quite some time, so reporting it to the mod author will probably not get much attention. Your best bet is to just remove it and hope everything else works without it. Is this a mod pack you made or one from Twitch or someplace like that? You might get some help from the mod pack author if you're lucky, but I doubt it for such an old mod pack.
There is also a very slight chance that updating Java to the most recent version and setting it as the version to use in the mod pack options might fix the issue, but's it's unlikely.
There is also another slight chance that removing Optifine might fix it as well, but also unlikely, but something to try.